20542012040 has 64 divisors (see below), whose sum is σ = 50941215360. Its totient is φ = 7392798720.

The previous prime is 20542011979. The next prime is 20542012061. The reversal of 20542012040 is 4021024502.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197972 + ... + 283331.

It is an arithmetic number, because the mean of its divisors is an integer number (795956490).

Almost surely, 2^20542012040 is an apocalyptic number.

20542012040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20542012040 is an abundant number, since it is smaller than the sum of its proper divisors (30399203320).

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

20542012040 is a wasteful number, since it uses less digits than its factorization.

20542012040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481422 (or 481418 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

Adding to 20542012040 its reverse (4021024502), we get a palindrome (24563036542).

The spelling of 20542012040 in words is "twenty billion, five hundred forty-two million, twelve thousand, forty".