20355864903 has 24 divisors (see below), whose sum is σ = 32113645200. Its totient is φ = 12322373760.

The previous prime is 20355864853. The next prime is 20355864911. The reversal of 20355864903 is 30946855302.

20355864903 is a `hidden beast` number, since 2 + 0 + 3 + 558 + 6 + 4 + 90 + 3 = 666.

It is not a de Polignac number, because 20355864903 - 2⁸ = 20355864647 is a prime.

It is a super-2 number, since 2×20355864903² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20355864973) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36078 + ... + 204971.

It is an arithmetic number, because the mean of its divisors is an integer number (1338068550).

Almost surely, 2^20355864903 is an apocalyptic number.

20355864903 is a deficient number, since it is larger than the sum of its proper divisors (11757780297).

20355864903 is a wasteful number, since it uses less digits than its factorization.

20355864903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241919 (or 241916 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The spelling of 20355864903 in words is "twenty billion, three hundred fifty-five million, eight hundred sixty-four thousand, nine hundred three".