20570388860 has 24 divisors (see below), whose sum is σ = 49368933600. Its totient is φ = 7052704704.

The previous prime is 20570388823. The next prime is 20570388863. The reversal of 20570388860 is 6888307502.

It is a super-2 number, since 2×20570388860² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20570388863) 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, 73465535 + ... + 73465814.

It is an arithmetic number, because the mean of its divisors is an integer number (2057038900).

Almost surely, 2^20570388860 is an apocalyptic number.

20570388860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20570388860 is an abundant number, since it is smaller than the sum of its proper divisors (28798544740).

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

20570388860 is a wasteful number, since it uses less digits than its factorization.

20570388860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146931365 (or 146931363 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 47.

The spelling of 20570388860 in words is "twenty billion, five hundred seventy million, three hundred eighty-eight thousand, eight hundred sixty".