20653407500 has 120 divisors (see below), whose sum is σ = 49738328640. Its totient is φ = 7439080000.

The previous prime is 20653407499. The next prime is 20653407521. The reversal of 20653407500 is 570435602.

It is a super-2 number, since 2×20653407500² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2938991 + ... + 2946009.

It is an arithmetic number, because the mean of its divisors is an integer number (414486072).

Almost surely, 2^20653407500 is an apocalyptic number.

20653407500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20653407500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24869164320).

20653407500 is an abundant number, since it is smaller than the sum of its proper divisors (29084921140).

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

20653407500 is a wasteful number, since it uses less digits than its factorization.

20653407500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7161 (or 7144 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 32.

The spelling of 20653407500 in words is "twenty billion, six hundred fifty-three million, four hundred seven thousand, five hundred".