20974634 has 16 divisors (see below), whose sum is σ = 34215048. Its totient is φ = 9603072.

The previous prime is 20974633. The next prime is 20974637. The reversal of 20974634 is 43647902.

It can be written as a sum of positive squares in 4 ways, for example, as 19758025 + 1216609 = 4445^2 + 1103^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20974594 and 20974603.

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

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7079 + ... + 9594.

Almost surely, 2^20974634 is an apocalyptic number.

20974634 is a deficient number, since it is larger than the sum of its proper divisors (13240414).

20974634 is a wasteful number, since it uses less digits than its factorization.

20974634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16729.

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 20974634 is about 4579.8072011822. The cubic root of 20974634 is about 275.7812889601.

The spelling of 20974634 in words is "twenty million, nine hundred seventy-four thousand, six hundred thirty-four".