20402102712 has 64 divisors (see below), whose sum is σ = 53421120000. Its totient is φ = 6480788864.

The previous prime is 20402102711. The next prime is 20402102723. The reversal of 20402102712 is 21720120402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20402102711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79789 + ... + 217187.

It is an arithmetic number, because the mean of its divisors is an integer number (834705000).

Almost surely, 2^20402102712 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20402102712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26710560000).

20402102712 is an abundant number, since it is smaller than the sum of its proper divisors (33019017288).

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

20402102712 is a wasteful number, since it uses less digits than its factorization.

20402102712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137700 (or 137696 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 21.

The spelling of 20402102712 in words is "twenty billion, four hundred two million, one hundred two thousand, seven hundred twelve".