20872635 has 32 divisors (see below), whose sum is σ = 38472192. Its totient is φ = 9465600.

The previous prime is 20872613. The next prime is 20872681. The reversal of 20872635 is 53627802.

20872635 = T₁₉₅ + T₁₉₆ + ... + T₅₀₉.

It is not a de Polignac number, because 20872635 - 2⁵ = 20872603 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20872596 and 20872605.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13660 + ... + 15110.

It is an arithmetic number, because the mean of its divisors is an integer number (1202256).

Almost surely, 2^20872635 is an apocalyptic number.

20872635 is a deficient number, since it is larger than the sum of its proper divisors (17599557).

20872635 is a wasteful number, since it uses less digits than its factorization.

20872635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1603.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 20872635 is about 4568.6578992085. The cubic root of 20872635 is about 275.3335237091. Note that the first 3 decimals are identical.

The spelling of 20872635 in words is "twenty million, eight hundred seventy-two thousand, six hundred thirty-five".