20201001 has 16 divisors (see below), whose sum is σ = 27899904. Its totient is φ = 12991104.

The previous prime is 20200993. The next prime is 20201021. The reversal of 20201001 is 10010202.

It is a happy number.

It is not a de Polignac number, because 20201001 - 2³ = 20200993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20201021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13381 + ... + 14813.

It is an arithmetic number, because the mean of its divisors is an integer number (1743744).

Almost surely, 2^20201001 is an apocalyptic number.

It is an amenable number.

20201001 is a deficient number, since it is larger than the sum of its proper divisors (7698903).

20201001 is a wasteful number, since it uses less digits than its factorization.

20201001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1600.

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 20201001 is about 4494.5523692577. The cubic root of 20201001 is about 272.3480666950.

Adding to 20201001 its reverse (10010202), we get a palindrome (30211203).

The spelling of 20201001 in words is "twenty million, two hundred one thousand, one".