20315251100 has 144 divisors (see below), whose sum is σ = 47156044320. Its totient is φ = 7582848000.

The previous prime is 20315251097. The next prime is 20315251133. The reversal of 20315251100 is 115251302.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12593894 + ... + 12595506.

It is an arithmetic number, because the mean of its divisors is an integer number (327472530).

Almost surely, 2^20315251100 is an apocalyptic number.

20315251100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20315251100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23578022160).

20315251100 is an abundant number, since it is smaller than the sum of its proper divisors (26840793220).

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

20315251100 is a wasteful number, since it uses less digits than its factorization.

20315251100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1800 (or 1793 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 20.

The spelling of 20315251100 in words is "twenty billion, three hundred fifteen million, two hundred fifty-one thousand, one hundred".