20501372140 has 12 divisors (see below), whose sum is σ = 43052881536. Its totient is φ = 8200548848.

The previous prime is 20501372137. The next prime is 20501372159. The reversal of 20501372140 is 4127310502.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 512534284 + ... + 512534323.

It is an arithmetic number, because the mean of its divisors is an integer number (3587740128).

Almost surely, 2^20501372140 is an apocalyptic number.

20501372140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20501372140 is an abundant number, since it is smaller than the sum of its proper divisors (22551509396).

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

20501372140 is a wasteful number, since it uses less digits than its factorization.

20501372140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025068616 (or 1025068614 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

Adding to 20501372140 its reverse (4127310502), we get a palindrome (24628682642).

The spelling of 20501372140 in words is "twenty billion, five hundred one million, three hundred seventy-two thousand, one hundred forty".