20508873 has 32 divisors (see below), whose sum is σ = 34836480. Its totient is φ = 10421760.

The previous prime is 20508853. The next prime is 20508877. The reversal of 20508873 is 37880502.

It is not a de Polignac number, because 20508873 - 2¹⁰ = 20507849 is a prime.

It is a super-2 number, since 2×20508873² = 841227743460258, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (20508877) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9913 + ... + 11801.

It is an arithmetic number, because the mean of its divisors is an integer number (1088640).

Almost surely, 2^20508873 is an apocalyptic number.

It is an amenable number.

20508873 is a deficient number, since it is larger than the sum of its proper divisors (14327607).

20508873 is a wasteful number, since it uses less digits than its factorization.

20508873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1957.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 20508873 is about 4528.6723219946. The cubic root of 20508873 is about 273.7246643636.

The spelling of 20508873 in words is "twenty million, five hundred eight thousand, eight hundred seventy-three".