20971746 has 48 divisors (see below), whose sum is σ = 47102328. Its totient is φ = 6739200.

The previous prime is 20971733. The next prime is 20971751. The reversal of 20971746 is 64717902.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3956121 + 17015625 = 1989^2 + 4125^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20971746.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 115776 + ... + 115956.

Almost surely, 2^20971746 is an apocalyptic number.

20971746 is an abundant number, since it is smaller than the sum of its proper divisors (26130582).

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

20971746 is a wasteful number, since it uses less digits than its factorization.

20971746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387 (or 384 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 20971746 is about 4579.4918932126. The cubic root of 20971746 is about 275.7686309257.

The spelling of 20971746 in words is "twenty million, nine hundred seventy-one thousand, seven hundred forty-six".