20021596824 has 32 divisors (see below), whose sum is σ = 50070496320. Its totient is φ = 6671665056.

The previous prime is 20021596811. The next prime is 20021596873. The reversal of 20021596824 is 42869512002.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62394 + ... + 209609.

It is an arithmetic number, because the mean of its divisors is an integer number (1564703010).

Almost surely, 2^20021596824 is an apocalyptic number.

20021596824 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20021596824 is an abundant number, since it is smaller than the sum of its proper divisors (30048899496).

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

20021596824 is a wasteful number, since it uses less digits than its factorization.

20021596824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275079 (or 275075 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The spelling of 20021596824 in words is "twenty billion, twenty-one million, five hundred ninety-six thousand, eight hundred twenty-four".