20978132 has 12 divisors (see below), whose sum is σ = 41956320. Its totient is φ = 8990616.

The previous prime is 20978129. The next prime is 20978141. The reversal of 20978132 is 23187902.

20978132 is an admirable number.

It is a congruent number.

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, 374582 + ... + 374637.

It is an arithmetic number, because the mean of its divisors is an integer number (3496360).

Almost surely, 2^20978132 is an apocalyptic number.

It is an amenable number.

20978132 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20978132 is a wasteful number, since it uses less digits than its factorization.

20978132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 749230 (or 749228 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 20978132 is about 4580.1890790665. The cubic root of 20978132 is about 275.7966190540.

The spelling of 20978132 in words is "twenty million, nine hundred seventy-eight thousand, one hundred thirty-two".