20221808 has 10 divisors (see below), whose sum is σ = 39179784. Its totient is φ = 10110896.

The previous prime is 20221801. The next prime is 20221811. The reversal of 20221808 is 80812202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20221801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631916 + ... + 631947.

Almost surely, 2^20221808 is an apocalyptic number.

It is an amenable number.

20221808 is a deficient number, since it is larger than the sum of its proper divisors (18957976).

20221808 is a wasteful number, since it uses less digits than its factorization.

20221808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1263871 (or 1263865 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 20221808 is about 4496.8664645506. The cubic root of 20221808 is about 272.4415406398.

The spelling of 20221808 in words is "twenty million, two hundred twenty-one thousand, eight hundred eight".