20156260 has 12 divisors (see below), whose sum is σ = 42328188. Its totient is φ = 8062496.

The previous prime is 20156243. The next prime is 20156281. The reversal of 20156260 is 6265102.

It can be written as a sum of positive squares in 2 ways, for example, as 10719076 + 9437184 = 3274^2 + 3072^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 503887 + ... + 503926.

It is an arithmetic number, because the mean of its divisors is an integer number (3527349).

Almost surely, 2^20156260 is an apocalyptic number.

20156260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20156260 is an abundant number, since it is smaller than the sum of its proper divisors (22171928).

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

20156260 is a wasteful number, since it uses less digits than its factorization.

20156260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1007822 (or 1007820 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 20156260 is about 4489.5723627089. The cubic root of 20156260 is about 272.1468533694.

The spelling of 20156260 in words is "twenty million, one hundred fifty-six thousand, two hundred sixty".