20125000000 has 280 divisors, whose sum is σ = 59531243904. Its totient is φ = 6600000000.

The previous prime is 20124999991. The next prime is 20125000043. The reversal of 20125000000 is 52102.

It is a tau number, because it is divible by the number of its divisors (280).

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 874999989 + ... + 875000011.

Almost surely, 2^20125000000 is an apocalyptic number.

20125000000 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 20125000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29765621952).

20125000000 is an abundant number, since it is smaller than the sum of its proper divisors (39406243904).

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

20125000000 is an frugal number, since it uses more digits than its factorization.

20125000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87 (or 37 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 10.

Adding to 20125000000 its reverse (52102), we get a palindrome (20125052102).

It can be divided in two parts, 20 and 125000000, that multiplied together give a square (2500000000 = 50000²).

The spelling of 20125000000 in words is "twenty billion, one hundred twenty-five million", and thus it is an aban number.