20974635 has 24 divisors (see below), whose sum is σ = 39662064. Its totient is φ = 10169280.

The previous prime is 20974633. The next prime is 20974637. The reversal of 20974635 is 53647902.

It is an interprime number because it is at equal distance from previous prime (20974633) and next prime (20974637).

It is not a de Polignac number, because 20974635 - 2¹ = 20974633 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20974635.

It is not an unprimeable number, because it can be changed into a prime (20974633) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20692 + ... + 21681.

It is an arithmetic number, because the mean of its divisors is an integer number (1652586).

Almost surely, 2^20974635 is an apocalyptic number.

20974635 is a deficient number, since it is larger than the sum of its proper divisors (18687429).

20974635 is a wasteful number, since it uses less digits than its factorization.

20974635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42395 (or 42392 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 20974635 is about 4579.8073103571. The cubic root of 20974635 is about 275.7812933429.

It can be divided in two parts, 20974 and 635, that added together give a square (21609 = 147²).

The spelling of 20974635 in words is "twenty million, nine hundred seventy-four thousand, six hundred thirty-five".