20295980 has 24 divisors (see below), whose sum is σ = 43775088. Its totient is φ = 7898688.

The previous prime is 20295967. The next prime is 20295991. The reversal of 20295980 is 8959202.

It is a self number, because there is not a number n which added to its sum of digits gives 20295980.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12974 + ... + 14453.

It is an arithmetic number, because the mean of its divisors is an integer number (1823962).

Almost surely, 2^20295980 is an apocalyptic number.

20295980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20295980 is an abundant number, since it is smaller than the sum of its proper divisors (23479108).

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

20295980 is a wasteful number, since it uses less digits than its factorization.

20295980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27473 (or 27471 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 20295980 is about 4505.1059920939. The cubic root of 20295980 is about 272.7742322505.

The spelling of 20295980 in words is "twenty million, two hundred ninety-five thousand, nine hundred eighty".