20775090 has 32 divisors (see below), whose sum is σ = 56983680. Its totient is φ = 4748544.

The previous prime is 20775089. The next prime is 20775103. The reversal of 20775090 is 9057702.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon 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, 49255 + ... + 49674.

It is an arithmetic number, because the mean of its divisors is an integer number (1780740).

Almost surely, 2^20775090 is an apocalyptic number.

20775090 is an abundant number, since it is smaller than the sum of its proper divisors (36208590).

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

20775090 is a wasteful number, since it uses less digits than its factorization.

20775090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98946.

The product of its (nonzero) digits is 4410, while the sum is 30.

The square root of 20775090 is about 4557.9699428583. The cubic root of 20775090 is about 274.9039444138.

The spelling of 20775090 in words is "twenty million, seven hundred seventy-five thousand, ninety".