20618956144 has 80 divisors (see below), whose sum is σ = 41402037600. Its totient is φ = 9941621760.

The previous prime is 20618956133. The next prime is 20618956151. The reversal of 20618956144 is 44165981602.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20618956094 and 20618956103.

It is a congruent number.

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, 20194354 + ... + 20195374.

It is an arithmetic number, because the mean of its divisors is an integer number (517525470).

Almost surely, 2^20618956144 is an apocalyptic number.

It is an amenable number.

20618956144 is an abundant number, since it is smaller than the sum of its proper divisors (20783081456).

20618956144 is a wasteful number, since it uses less digits than its factorization.

20618956144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1418 (or 1412 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 46.

The spelling of 20618956144 in words is "twenty billion, six hundred eighteen million, nine hundred fifty-six thousand, one hundred forty-four".