21920798 has 24 divisors (see below), whose sum is σ = 34976568. Its totient is φ = 10290672.

The previous prime is 21920797. The next prime is 21920819. The reversal of 21920798 is 89702912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21920791) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 264065 + ... + 264147.

It is an arithmetic number, because the mean of its divisors is an integer number (1457357).

Almost surely, 2^21920798 is an apocalyptic number.

21920798 is a deficient number, since it is larger than the sum of its proper divisors (13055770).

21920798 is an equidigital number, since it uses as much as digits as its factorization.

21920798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248 (or 165 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 21920798 is about 4681.9651856886. The cubic root of 21920798 is about 279.8672755318.

The spelling of 21920798 in words is "twenty-one million, nine hundred twenty thousand, seven hundred ninety-eight".