20158660 has 12 divisors (see below), whose sum is σ = 42333228. Its totient is φ = 8063456.

The previous prime is 20158627. The next prime is 20158661. The reversal of 20158660 is 6685102.

It can be written as a sum of positive squares in 2 ways, for example, as 14077504 + 6081156 = 3752^2 + 2466^2 .

It is not an unprimeable number, because it can be changed into a prime (20158661) 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, 503947 + ... + 503986.

It is an arithmetic number, because the mean of its divisors is an integer number (3527769).

Almost surely, 2^20158660 is an apocalyptic number.

20158660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20158660 is an abundant number, since it is smaller than the sum of its proper divisors (22174568).

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

20158660 is a wasteful number, since it uses less digits than its factorization.

20158660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1007942 (or 1007940 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 20158660 is about 4489.8396407890. The cubic root of 20158660 is about 272.1576544229.

The spelling of 20158660 in words is "twenty million, one hundred fifty-eight thousand, six hundred sixty".