20769855 has 16 divisors (see below), whose sum is σ = 33458400. Its totient is φ = 11001728.

The previous prime is 20769823. The next prime is 20769857. The reversal of 20769855 is 55896702.

It is a cyclic number.

It is not a de Polignac number, because 20769855 - 2⁵ = 20769823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20769857) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2412 + ... + 6881.

It is an arithmetic number, because the mean of its divisors is an integer number (2091150).

Almost surely, 2^20769855 is an apocalyptic number.

20769855 is a deficient number, since it is larger than the sum of its proper divisors (12688545).

20769855 is a wasteful number, since it uses less digits than its factorization.

20769855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9450.

The product of its (nonzero) digits is 151200, while the sum is 42.

The square root of 20769855 is about 4557.3956378616. The cubic root of 20769855 is about 274.8808519660.

The spelling of 20769855 in words is "twenty million, seven hundred sixty-nine thousand, eight hundred fifty-five".