20901790 has 64 divisors (see below), whose sum is σ = 46964736. Its totient is φ = 6521472.

The previous prime is 20901763. The next prime is 20901791. The reversal of 20901790 is 9710902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20901791) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 93619 + ... + 93841.

It is an arithmetic number, because the mean of its divisors is an integer number (733824).

Almost surely, 2^20901790 is an apocalyptic number.

20901790 is an abundant number, since it is smaller than the sum of its proper divisors (26062946).

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

20901790 is a wasteful number, since it uses less digits than its factorization.

20901790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353.

The product of its (nonzero) digits is 1134, while the sum is 28.

The square root of 20901790 is about 4571.8475477645. The cubic root of 20901790 is about 275.4616598106.

The spelling of 20901790 in words is "twenty million, nine hundred one thousand, seven hundred ninety".