20939432 has 8 divisors (see below), whose sum is σ = 39261450. Its totient is φ = 10469712.

The previous prime is 20939419. The next prime is 20939459. The reversal of 20939432 is 23493902.

It can be written as a sum of positive squares in only one way, i.e., 20921476 + 17956 = 4574^2 + 134^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1308707 + ... + 1308722.

Almost surely, 2^20939432 is an apocalyptic number.

It is an amenable number.

20939432 is a deficient number, since it is larger than the sum of its proper divisors (18322018).

20939432 is a wasteful number, since it uses less digits than its factorization.

20939432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2617435 (or 2617431 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 20939432 is about 4575.9624124330. The cubic root of 20939432 is about 275.6269201314.

The spelling of 20939432 in words is "twenty million, nine hundred thirty-nine thousand, four hundred thirty-two".