20466531 has 12 divisors (see below), whose sum is σ = 29980080. Its totient is φ = 13451760.

The previous prime is 20466497. The next prime is 20466577. The reversal of 20466531 is 13566402.

20466531 is a `hidden beast` number, since 2 + 0 + 4 + 6 + 653 + 1 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-20466531 is a prime.

It is a super-2 number, since 2×20466531² = 837757782347922, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 20466495 and 20466504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20466331) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15376 + ... + 16653.

It is an arithmetic number, because the mean of its divisors is an integer number (2498340).

Almost surely, 2^20466531 is an apocalyptic number.

20466531 is a deficient number, since it is larger than the sum of its proper divisors (9513549).

20466531 is a wasteful number, since it uses less digits than its factorization.

20466531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32106 (or 32103 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 20466531 is about 4523.9950265225. The cubic root of 20466531 is about 273.5361600180.

The spelling of 20466531 in words is "twenty million, four hundred sixty-six thousand, five hundred thirty-one".