20949580 has 12 divisors (see below), whose sum is σ = 43994160. Its totient is φ = 8379824.

The previous prime is 20949563. The next prime is 20949601. The reversal of 20949580 is 8594902.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 523720 + ... + 523759.

It is an arithmetic number, because the mean of its divisors is an integer number (3666180).

Almost surely, 2^20949580 is an apocalyptic number.

20949580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20949580 is an abundant number, since it is smaller than the sum of its proper divisors (23044580).

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

20949580 is a wasteful number, since it uses less digits than its factorization.

20949580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1047488 (or 1047486 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 20949580 is about 4577.0711158993. The cubic root of 20949580 is about 275.6714391717.

The spelling of 20949580 in words is "twenty million, nine hundred forty-nine thousand, five hundred eighty".