20974690 has 32 divisors (see below), whose sum is σ = 42073344. Its totient is φ = 7463040.

The previous prime is 20974687. The next prime is 20974691. The reversal of 20974690 is 9647902.

It is a super-2 number, since 2×20974690² = 879875241192200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20974691) 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 15 ways as a sum of consecutive naturals, for example, 3142 + ... + 7198.

It is an arithmetic number, because the mean of its divisors is an integer number (1314792).

Almost surely, 2^20974690 is an apocalyptic number.

20974690 is an abundant number, since it is smaller than the sum of its proper divisors (21098654).

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

20974690 is a wasteful number, since it uses less digits than its factorization.

20974690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4122.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 20974690 is about 4579.8133149726. The cubic root of 20974690 is about 275.7815343953.

The spelling of 20974690 in words is "twenty million, nine hundred seventy-four thousand, six hundred ninety".