20616855 has 32 divisors (see below), whose sum is σ = 39343104. Its totient is φ = 9014016.

The previous prime is 20616803. The next prime is 20616863. The reversal of 20616855 is 55861602.

It is not a de Polignac number, because 20616855 - 2¹⁰ = 20615831 is a prime.

It is a congruent number.

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, 1854 + ... + 6683.

It is an arithmetic number, because the mean of its divisors is an integer number (1229472).

Almost surely, 2^20616855 is an apocalyptic number.

20616855 is a deficient number, since it is larger than the sum of its proper divisors (18726249).

20616855 is a wasteful number, since it uses less digits than its factorization.

20616855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8575.

The product of its (nonzero) digits is 14400, while the sum is 33.

The square root of 20616855 is about 4540.5787076099. The cubic root of 20616855 is about 274.2042228690.

The spelling of 20616855 in words is "twenty million, six hundred sixteen thousand, eight hundred fifty-five".