20158732 has 24 divisors (see below), whose sum is σ = 38610432. Its totient is φ = 9133200.

The previous prime is 20158717. The next prime is 20158739. The reversal of 20158732 is 23785102.

It is a self number, because there is not a number n which added to its sum of digits gives 20158732.

It is not an unprimeable number, because it can be changed into a prime (20158739) 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 7 ways as a sum of consecutive naturals, for example, 18433 + ... + 19495.

It is an arithmetic number, because the mean of its divisors is an integer number (1608768).

Almost surely, 2^20158732 is an apocalyptic number.

20158732 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20158732 is a deficient number, since it is larger than the sum of its proper divisors (18451700).

20158732 is a wasteful number, since it uses less digits than its factorization.

20158732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1509 (or 1507 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 20158732 is about 4489.8476588855. The cubic root of 20158732 is about 272.1579784412.

The spelling of 20158732 in words is "twenty million, one hundred fifty-eight thousand, seven hundred thirty-two".