20971552637 has 8 divisors (see below), whose sum is σ = 23970254976. Its totient is φ = 17973541872.

The previous prime is 20971552619. The next prime is 20971552663. The reversal of 20971552637 is 73625517902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20971552637 - 2²² = 20967358333 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20971552591 and 20971552600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20971557637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106193 + ... + 230694.

It is an arithmetic number, because the mean of its divisors is an integer number (2996281872).

Almost surely, 2^20971552637 is an apocalyptic number.

It is an amenable number.

20971552637 is a deficient number, since it is larger than the sum of its proper divisors (2998702339).

20971552637 is an equidigital number, since it uses as much as digits as its factorization.

20971552637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345787.

The product of its (nonzero) digits is 793800, while the sum is 47.

The spelling of 20971552637 in words is "twenty billion, nine hundred seventy-one million, five hundred fifty-two thousand, six hundred thirty-seven".