20813432 has 8 divisors (see below), whose sum is σ = 39025200. Its totient is φ = 10406712.

The previous prime is 20813399. The next prime is 20813447. The reversal of 20813432 is 23431802.

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

It is a junction number, because it is equal to n+sod(n) for n = 20813398 and 20813407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1300832 + ... + 1300847.

It is an arithmetic number, because the mean of its divisors is an integer number (4878150).

Almost surely, 2^20813432 is an apocalyptic number.

It is an amenable number.

20813432 is a deficient number, since it is larger than the sum of its proper divisors (18211768).

20813432 is a wasteful number, since it uses less digits than its factorization.

20813432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2601685 (or 2601681 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 20813432 is about 4562.1740431509. The cubic root of 20813432 is about 275.0729591542.

The spelling of 20813432 in words is "twenty million, eight hundred thirteen thousand, four hundred thirty-two".