17920428 has 12 divisors (see below), whose sum is σ = 41814360. Its totient is φ = 5973472.

The previous prime is 17920411. The next prime is 17920429. The reversal of 17920428 is 82402971.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×17920428² = 642283479406368, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (17920429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 746673 + ... + 746696.

It is an arithmetic number, because the mean of its divisors is an integer number (3484530).

Almost surely, 2^17920428 is an apocalyptic number.

It is an amenable number.

17920428 is an abundant number, since it is smaller than the sum of its proper divisors (23893932).

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

17920428 is a wasteful number, since it uses less digits than its factorization.

17920428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1493376 (or 1493374 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 17920428 is about 4233.2526501498. The cubic root of 17920428 is about 261.6873881562.

The spelling of 17920428 in words is "seventeen million, nine hundred twenty thousand, four hundred twenty-eight".