20563172 has 24 divisors (see below), whose sum is σ = 41241984. Its totient is φ = 8788032.

The previous prime is 20563163. The next prime is 20563189. The reversal of 20563172 is 27136502.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11993 + ... + 13599.

It is an arithmetic number, because the mean of its divisors is an integer number (1718416).

Almost surely, 2^20563172 is an apocalyptic number.

It is an amenable number.

20563172 is an abundant number, since it is smaller than the sum of its proper divisors (20678812).

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

20563172 is a wasteful number, since it uses less digits than its factorization.

20563172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2075 (or 2073 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 20563172 is about 4534.6633833174. The cubic root of 20563172 is about 273.9660213251.

Adding to 20563172 its reverse (27136502), we get a palindrome (47699674).

The spelling of 20563172 in words is "twenty million, five hundred sixty-three thousand, one hundred seventy-two".