21920802 has 8 divisors (see below), whose sum is σ = 43841616. Its totient is φ = 7306932.

The previous prime is 21920797. The next prime is 21920819. The reversal of 21920802 is 20802912.

It is a sphenic number, since it is the product of 3 distinct primes.

21920802 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1826728 + ... + 1826739.

It is an arithmetic number, because the mean of its divisors is an integer number (5480202).

Almost surely, 2^21920802 is an apocalyptic number.

21920802 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21920802 is a wasteful number, since it uses less digits than its factorization.

21920802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3653472.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 21920802 is about 4681.9656128596. The cubic root of 21920802 is about 279.8672925547.

It can be divided in two parts, 21920 and 802, that added together give a palindrome (22722).

The spelling of 21920802 in words is "twenty-one million, nine hundred twenty thousand, eight hundred two".