20573172 has 18 divisors (see below), whose sum is σ = 52004498. Its totient is φ = 6857712.

The previous prime is 20573159. The next prime is 20573227. The reversal of 20573172 is 27137502.

20573172 is a `hidden beast` number, since 20 + 573 + 1 + 72 = 666.

It can be written as a sum of positive squares in only one way, i.e., 13571856 + 7001316 = 3684^2 + 2646^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×20573172² = 846510812283168, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 285703 + ... + 285774.

Almost surely, 2^20573172 is an apocalyptic number.

It is an amenable number.

20573172 is an abundant number, since it is smaller than the sum of its proper divisors (31431326).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20573172 is a wasteful number, since it uses less digits than its factorization.

20573172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571487 (or 571482 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 27.

The square root of 20573172 is about 4535.7658669733. The cubic root of 20573172 is about 274.0104245949.

The spelling of 20573172 in words is "twenty million, five hundred seventy-three thousand, one hundred seventy-two".