20158900 has 18 divisors (see below), whose sum is σ = 43745030. Its totient is φ = 8063520.

The previous prime is 20158891. The next prime is 20158909. The reversal of 20158900 is 985102.

It is an interprime number because it is at equal distance from previous prime (20158891) and next prime (20158909).

It can be written as a sum of positive squares in 3 ways, for example, as 992016 + 19166884 = 996^2 + 4378^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20158909) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 100695 + ... + 100894.

Almost surely, 2^20158900 is an apocalyptic number.

20158900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20158900 is an abundant number, since it is smaller than the sum of its proper divisors (23586130).

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

20158900 is a wasteful number, since it uses less digits than its factorization.

20158900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201603 (or 201596 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 20158900 is about 4489.8663677219. The cubic root of 20158900 is about 272.1587344811.

The spelling of 20158900 in words is "twenty million, one hundred fifty-eight thousand, nine hundred".