20100900 has 36 divisors (see below), whose sum is σ = 58159472. Its totient is φ = 5360160.

The previous prime is 20100893. The next prime is 20100907. The reversal of 20100900 is 900102.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20100893) and next prime (20100907).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (20100907) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33202 + ... + 33801.

Almost surely, 2^20100900 is an apocalyptic number.

20100900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20100900 is an abundant number, since it is smaller than the sum of its proper divisors (38058572).

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

20100900 is a wasteful number, since it uses less digits than its factorization.

20100900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67020 (or 67013 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 20100900 is about 4483.4027256092. The cubic root of 20100900 is about 271.8974707283.

The spelling of 20100900 in words is "twenty million, one hundred thousand, nine hundred".