20725107100 has 72 divisors (see below), whose sum is σ = 45308294528. Its totient is φ = 8228563200.

The previous prime is 20725107083. The next prime is 20725107101. The reversal of 20725107100 is 170152702.

It is a happy number.

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 (20725107101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8851930 + ... + 8854270.

Almost surely, 2^20725107100 is an apocalyptic number.

20725107100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20725107100 is an abundant number, since it is smaller than the sum of its proper divisors (24583187428).

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

20725107100 is a wasteful number, since it uses less digits than its factorization.

20725107100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2975 (or 2968 counting only the distinct ones).

The product of its (nonzero) digits is 980, while the sum is 25.

Adding to 20725107100 its reverse (170152702), we get a palindrome (20895259802).

The spelling of 20725107100 in words is "twenty billion, seven hundred twenty-five million, one hundred seven thousand, one hundred".