18520022 has 24 divisors (see below), whose sum is σ = 29708856. Its totient is φ = 8656704.

The previous prime is 18520001. The next prime is 18520031. The reversal of 18520022 is 22002581.

It is a junction number, because it is equal to n+sod(n) for n = 18519976 and 18520003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 81473 + ... + 81699.

It is an arithmetic number, because the mean of its divisors is an integer number (1237869).

Almost surely, 2^18520022 is an apocalyptic number.

18520022 is a deficient number, since it is larger than the sum of its proper divisors (11188834).

18520022 is a wasteful number, since it uses less digits than its factorization.

18520022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380 (or 361 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 18520022 is about 4303.4895143360. The cubic root of 18520022 is about 264.5740016852.

The spelling of 18520022 in words is "eighteen million, five hundred twenty thousand, twenty-two".