20425138237440 has 156 divisors (see below), whose sum is σ = 70798503078264. Its totient is φ = 5446703480832.

The previous prime is 20425138237411. The next prime is 20425138237447. The reversal of 20425138237440 is 4473283152402.

20425138237440 is a `hidden beast` number, since 2 + 0 + 4 + 2 + 513 + 8 + 23 + 74 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20425138237447) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55222414 + ... + 55591053.

It is an arithmetic number, because the mean of its divisors is an integer number (453836558194).

Almost surely, 2^{20425138237440} is an apocalyptic number.

20425138237440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20425138237440 is an abundant number, since it is smaller than the sum of its proper divisors (50373364840824).

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

20425138237440 is a wasteful number, since it uses less digits than its factorization.

20425138237440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110813502 (or 110813477 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 45.

The spelling of 20425138237440 in words is "twenty trillion, four hundred twenty-five billion, one hundred thirty-eight million, two hundred thirty-seven thousand, four hundred forty".