20900889 has 8 divisors (see below), whose sum is σ = 30964320. Its totient is φ = 13933908.

The previous prime is 20900879. The next prime is 20900897. The reversal of 20900889 is 98800902.

It is not a de Polignac number, because 20900889 - 2⁹ = 20900377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20900879) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 387027 + ... + 387080.

It is an arithmetic number, because the mean of its divisors is an integer number (3870540).

Almost surely, 2^20900889 is an apocalyptic number.

It is an amenable number.

20900889 is a deficient number, since it is larger than the sum of its proper divisors (10063431).

20900889 is an equidigital number, since it uses as much as digits as its factorization.

20900889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774116 (or 774110 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 20900889 is about 4571.7490088586. The cubic root of 20900889 is about 275.4577017043.

The spelling of 20900889 in words is "twenty million, nine hundred thousand, eight hundred eighty-nine".