20643202892 has 12 divisors (see below), whose sum is σ = 38904497856. Its totient is φ = 9527632080.

The previous prime is 20643202891. The next prime is 20643202913. The reversal of 20643202892 is 29820234602.

It is a super-2 number, since 2×20643202892² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20643202891) 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, 198492284 + ... + 198492387.

It is an arithmetic number, because the mean of its divisors is an integer number (3242041488).

Almost surely, 2^20643202892 is an apocalyptic number.

It is an amenable number.

20643202892 is a deficient number, since it is larger than the sum of its proper divisors (18261294964).

20643202892 is a wasteful number, since it uses less digits than its factorization.

20643202892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396984688 (or 396984686 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 38.

The spelling of 20643202892 in words is "twenty billion, six hundred forty-three million, two hundred two thousand, eight hundred ninety-two".