20804923731 has 8 divisors (see below), whose sum is σ = 29371657104. Its totient is φ = 13054069760.

The previous prime is 20804923729. The next prime is 20804923801. The reversal of 20804923731 is 13732940802.

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

It is a cyclic number.

It is not a de Polignac number, because 20804923731 - 2¹ = 20804923729 is a prime.

It is a super-2 number, since 2×20804923731² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20804923731.

It is not an unprimeable number, because it can be changed into a prime (20804923831) 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, 203969790 + ... + 203969891.

It is an arithmetic number, because the mean of its divisors is an integer number (3671457138).

Almost surely, 2^20804923731 is an apocalyptic number.

20804923731 is a deficient number, since it is larger than the sum of its proper divisors (8566733373).

20804923731 is a wasteful number, since it uses less digits than its factorization.

20804923731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407939701.

The product of its (nonzero) digits is 72576, while the sum is 39.

The spelling of 20804923731 in words is "twenty billion, eight hundred four million, nine hundred twenty-three thousand, seven hundred thirty-one".