20923290 has 48 divisors (see below), whose sum is σ = 54632448. Its totient is φ = 5555808.

The previous prime is 20923289. The next prime is 20923303. The reversal of 20923290 is 9232902.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34167 + ... + 34773.

It is an arithmetic number, because the mean of its divisors is an integer number (1138176).

Almost surely, 2^20923290 is an apocalyptic number.

20923290 is an abundant number, since it is smaller than the sum of its proper divisors (33709158).

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

20923290 is a wasteful number, since it uses less digits than its factorization.

20923290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1003 (or 1000 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 20923290 is about 4574.1982904111. The cubic root of 20923290 is about 275.5560759062.

The spelling of 20923290 in words is "twenty million, nine hundred twenty-three thousand, two hundred ninety".