20971603635 has 16 divisors (see below), whose sum is σ = 33760425984. Its totient is φ = 11116235232.

The previous prime is 20971603621. The next prime is 20971603637. The reversal of 20971603635 is 53630617902.

It is not a de Polignac number, because 20971603635 - 2¹⁴ = 20971587251 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20971603637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4286227 + ... + 4291116.

It is an arithmetic number, because the mean of its divisors is an integer number (2110026624).

Almost surely, 2^20971603635 is an apocalyptic number.

20971603635 is a deficient number, since it is larger than the sum of its proper divisors (12788822349).

20971603635 is a wasteful number, since it uses less digits than its factorization.

20971603635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8577514.

The product of its (nonzero) digits is 204120, while the sum is 42.

The spelling of 20971603635 in words is "twenty billion, nine hundred seventy-one million, six hundred three thousand, six hundred thirty-five".