20512023999 has 32 divisors (see below), whose sum is σ = 29836681920. Its totient is φ = 12482076672.

The previous prime is 20512023989. The next prime is 20512024031. The reversal of 20512023999 is 99932021502.

It is not a de Polignac number, because 20512023999 - 2¹⁷ = 20511892927 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20512023999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20512023929) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 573267 + ... + 607995.

It is an arithmetic number, because the mean of its divisors is an integer number (932396310).

Almost surely, 2^20512023999 is an apocalyptic number.

20512023999 is a deficient number, since it is larger than the sum of its proper divisors (9324657921).

20512023999 is a wasteful number, since it uses less digits than its factorization.

20512023999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35099.

The product of its (nonzero) digits is 87480, while the sum is 42.

The spelling of 20512023999 in words is "twenty billion, five hundred twelve million, twenty-three thousand, nine hundred ninety-nine".