20447643683952 has 30 divisors (see below), whose sum is σ = 57225002810352. Its totient is φ = 6815881227936.

The previous prime is 20447643683939. The next prime is 20447643684023. The reversal of 20447643683952 is 25938634674402.

It is a happy number.

20447643683952 is a `hidden beast` number, since 2 + 0 + 4 + 4 + 76 + 436 + 83 + 9 + 52 = 666.

It is a super-2 number, since 2×20447643683952² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20447643683952.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 70998762648 + ... + 70998762935.

Almost surely, 2^{20447643683952} is an apocalyptic number.

It is an amenable number.

20447643683952 is an abundant number, since it is smaller than the sum of its proper divisors (36777359126400).

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

20447643683952 is a wasteful number, since it uses less digits than its factorization.

20447643683952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141997525597 (or 141997525588 counting only the distinct ones).

The product of its (nonzero) digits is 209018880, while the sum is 63.

The spelling of 20447643683952 in words is "twenty trillion, four hundred forty-seven billion, six hundred forty-three million, six hundred eighty-three thousand, nine hundred fifty-two".