20425640742 has 48 divisors (see below), whose sum is σ = 47945308320. Its totient is φ = 6247166976.

The previous prime is 20425640717. The next prime is 20425640749. The reversal of 20425640742 is 24704652402.

20425640742 is a `hidden beast` number, since 2 + 0 + 4 + 2 + 5 + 640 + 7 + 4 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 20425640697 and 20425640706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20425640749) 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, 222267 + ... + 300422.

It is an arithmetic number, because the mean of its divisors is an integer number (998860590).

Almost surely, 2^20425640742 is an apocalyptic number.

20425640742 is an abundant number, since it is smaller than the sum of its proper divisors (27519667578).

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

20425640742 is a wasteful number, since it uses less digits than its factorization.

20425640742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522877 (or 522874 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 36.

The spelling of 20425640742 in words is "twenty billion, four hundred twenty-five million, six hundred forty thousand, seven hundred forty-two".