20432656 has 10 divisors (see below), whose sum is σ = 39588302. Its totient is φ = 10216320.

The previous prime is 20432609. The next prime is 20432663. The reversal of 20432656 is 65623402.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 12138256 + 8294400 = 3484^2 + 2880^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 638505 + ... + 638536.

Almost surely, 2^20432656 is an apocalyptic number.

It is an amenable number.

20432656 is a deficient number, since it is larger than the sum of its proper divisors (19155646).

20432656 is a wasteful number, since it uses less digits than its factorization.

20432656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1277049 (or 1277043 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 20432656 is about 4520.2495506332. The cubic root of 20432656 is about 273.3851630182.

The spelling of 20432656 in words is "twenty million, four hundred thirty-two thousand, six hundred fifty-six".