20700557424 has 80 divisors (see below), whose sum is σ = 60682544640. Its totient is φ = 6753366720.

The previous prime is 20700557411. The next prime is 20700557443. The reversal of 20700557424 is 42475500702.

It is a happy number.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 489462 + ... + 530069.

It is an arithmetic number, because the mean of its divisors is an integer number (758531808).

Almost surely, 2^20700557424 is an apocalyptic number.

20700557424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20700557424 is an abundant number, since it is smaller than the sum of its proper divisors (39981987216).

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

20700557424 is a wasteful number, since it uses less digits than its factorization.

20700557424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1019595 (or 1019583 counting only the distinct ones).

The product of its (nonzero) digits is 78400, while the sum is 36.

The spelling of 20700557424 in words is "twenty billion, seven hundred million, five hundred fifty-seven thousand, four hundred twenty-four".