20643032 has 16 divisors (see below), whose sum is σ = 40982760. Its totient is φ = 9714304.

The previous prime is 20642971. The next prime is 20643043. The reversal of 20643032 is 23034602.

It is a super-2 number, since 2×20643032² = 852269540306048, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20642995 and 20643013.

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, 75758 + ... + 76029.

Almost surely, 2^20643032 is an apocalyptic number.

It is an amenable number.

20643032 is a deficient number, since it is larger than the sum of its proper divisors (20339728).

20643032 is a wasteful number, since it uses less digits than its factorization.

20643032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151810 (or 151806 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 20643032 is about 4543.4603552799. The cubic root of 20643032 is about 274.3202251756.

Adding to 20643032 its reverse (23034602), we get a palindrome (43677634).

The spelling of 20643032 in words is "twenty million, six hundred forty-three thousand, thirty-two".