20886920 has 32 divisors (see below), whose sum is σ = 47421720. Its totient is φ = 8279040.

The previous prime is 20886919. The next prime is 20886953. The reversal of 20886920 is 2968802.

It can be written as a sum of positive squares in 4 ways, for example, as 9012004 + 11874916 = 3002^2 + 3446^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2210 + ... + 6830.

Almost surely, 2^20886920 is an apocalyptic number.

20886920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20886920 is an abundant number, since it is smaller than the sum of its proper divisors (26534800).

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

20886920 is a wasteful number, since it uses less digits than its factorization.

20886920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4745 (or 4741 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 20886920 is about 4570.2210012208. The cubic root of 20886920 is about 275.3963211224.

The spelling of 20886920 in words is "twenty million, eight hundred eighty-six thousand, nine hundred twenty".