20321904652 has 36 divisors (see below), whose sum is σ = 43803104184. Its totient is φ = 8197069440.

The previous prime is 20321904637. The next prime is 20321904671. The reversal of 20321904652 is 25640912302.

It is a super-2 number, since 2×20321904652² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3046174 + ... + 3052837.

It is an arithmetic number, because the mean of its divisors is an integer number (1216752894).

Almost surely, 2^20321904652 is an apocalyptic number.

It is an amenable number.

20321904652 is an abundant number, since it is smaller than the sum of its proper divisors (23481199532).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20321904652 is a wasteful number, since it uses less digits than its factorization.

20321904652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6099046 (or 6099037 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The spelling of 20321904652 in words is "twenty billion, three hundred twenty-one million, nine hundred four thousand, six hundred fifty-two".