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20311243 = 175322543
BaseRepresentation
bin100110101111…
…0110011001011
31102012220210021
41031132303023
520144424433
62003201311
7334433311
oct115366313
942186707
1020311243
1110513157
126976237
134291cb4
1429aa0b1
151bb322d
hex135eccb

20311243 has 8 divisors (see below), whose sum is σ = 21912768. Its totient is φ = 18754944.

The previous prime is 20311211. The next prime is 20311273. The reversal of 20311243 is 34211302.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20311243 - 25 = 20311211 is a prime.

It is a Duffinian number.

It is a zygodrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (20311273) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10371 + ... + 12172.

It is an arithmetic number, because the mean of its divisors is an integer number (2739096).

Almost surely, 220311243 is an apocalyptic number.

20311243 is a deficient number, since it is larger than the sum of its proper divisors (1601525).

20311243 is a wasteful number, since it uses less digits than its factorization.

20311243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22613.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 20311243 is about 4506.7996405432. The cubic root of 20311243 is about 272.8425924200.

Adding to 20311243 its reverse (34211302), we get a palindrome (54522545).

The spelling of 20311243 in words is "twenty million, three hundred eleven thousand, two hundred forty-three".

Divisors: 1 17 53 901 22543 383231 1194779 20311243