20745880 has 32 divisors (see below), whose sum is σ = 47381040. Its totient is φ = 8173440.

The previous prime is 20745871. The next prime is 20745883. The reversal of 20745880 is 8854702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20745883) 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, 1191 + ... + 6550.

Almost surely, 2^20745880 is an apocalyptic number.

20745880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20745880 is an abundant number, since it is smaller than the sum of its proper divisors (26635160).

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

20745880 is a wasteful number, since it uses less digits than its factorization.

20745880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7819 (or 7815 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 20745880 is about 4554.7645383708. The cubic root of 20745880 is about 274.7750446825.

The spelling of 20745880 in words is "twenty million, seven hundred forty-five thousand, eight hundred eighty".