20642265400 has 48 divisors (see below), whose sum is σ = 50079942000. Its totient is φ = 7897908480.

The previous prime is 20642265359. The next prime is 20642265401. The reversal of 20642265400 is 456224602.

It is a super-2 number, since 2×20642265400² (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 (20642265401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2239125 + ... + 2248324.

It is an arithmetic number, because the mean of its divisors is an integer number (1043332125).

Almost surely, 2^20642265400 is an apocalyptic number.

20642265400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20642265400 is an abundant number, since it is smaller than the sum of its proper divisors (29437676600).

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

20642265400 is a wasteful number, since it uses less digits than its factorization.

20642265400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4487488 (or 4487479 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 31.

The spelling of 20642265400 in words is "twenty billion, six hundred forty-two million, two hundred sixty-five thousand, four hundred".