20908855 has 16 divisors (see below), whose sum is σ = 28317600. Its totient is φ = 14680960.

The previous prime is 20908837. The next prime is 20908883. The reversal of 20908855 is 55880902.

It is a happy number.

It is not a de Polignac number, because 20908855 - 2¹¹ = 20906807 is a prime.

It is a super-2 number, since 2×20908855² = 874360434822050, 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 15 ways as a sum of consecutive naturals, for example, 4960 + ... + 8149.

It is an arithmetic number, because the mean of its divisors is an integer number (1769850).

Almost surely, 2^20908855 is an apocalyptic number.

20908855 is a deficient number, since it is larger than the sum of its proper divisors (7408745).

20908855 is a wasteful number, since it uses less digits than its factorization.

20908855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13154.

The product of its (nonzero) digits is 28800, while the sum is 37.

The square root of 20908855 is about 4572.6201460432. The cubic root of 20908855 is about 275.4926925180.

The spelling of 20908855 in words is "twenty million, nine hundred eight thousand, eight hundred fifty-five".