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20201201 = 115117551
BaseRepresentation
bin100110100001…
…1111011110001
31102000022211122
41031003323301
520132414301
62000552025
7333464426
oct115037361
942008748
1020201201
1110448509
126922615
134253b97
14297bd4d
151b9081b
hex1343ef1

20201201 has 4 divisors (see below), whose sum is σ = 20219904. Its totient is φ = 20182500.

The previous prime is 20201191. The next prime is 20201227. The reversal of 20201201 is 10210202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10210202 = 25105101.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-20201201 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20201231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7625 + ... + 9926.

It is an arithmetic number, because the mean of its divisors is an integer number (5054976).

Almost surely, 220201201 is an apocalyptic number.

It is an amenable number.

20201201 is a deficient number, since it is larger than the sum of its proper divisors (18703).

20201201 is a wasteful number, since it uses less digits than its factorization.

20201201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18702.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 20201201 is about 4494.5746183593. The cubic root of 20201201 is about 272.3489654860.

Adding to 20201201 its reverse (10210202), we get a palindrome (30411403).

Subtracting from 20201201 its reverse (10210202), we obtain a palindrome (9990999).

It can be divided in two parts, 20201 and 201, that added together give a palindrome (20402).

The spelling of 20201201 in words is "twenty million, two hundred one thousand, two hundred one".

Divisors: 1 1151 17551 20201201