20902473 has 6 divisors (see below), whose sum is σ = 30192474. Its totient is φ = 13934976.

The previous prime is 20902457. The next prime is 20902493. The reversal of 20902473 is 37420902.

It can be written as a sum of positive squares in only one way, i.e., 18688329 + 2214144 = 4323^2 + 1488^2 .

It is not a de Polignac number, because 20902473 - 2⁴ = 20902457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20902493) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1161240 + ... + 1161257.

It is an arithmetic number, because the mean of its divisors is an integer number (5032079).

Almost surely, 2^20902473 is an apocalyptic number.

It is an amenable number.

20902473 is a deficient number, since it is larger than the sum of its proper divisors (9290001).

20902473 is a wasteful number, since it uses less digits than its factorization.

20902473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2322503 (or 2322500 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 20902473 is about 4571.9222434333. The cubic root of 20902473 is about 275.4646601639.

The spelling of 20902473 in words is "twenty million, nine hundred two thousand, four hundred seventy-three".