20970538 has 8 divisors (see below), whose sum is σ = 32540580. Its totient is φ = 10123680.

The previous prime is 20970533. The next prime is 20970553. The reversal of 20970538 is 83507902.

It can be written as a sum of positive squares in 2 ways, for example, as 20948929 + 21609 = 4577^2 + 147^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20970533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180723 + ... + 180838.

Almost surely, 2^20970538 is an apocalyptic number.

20970538 is a deficient number, since it is larger than the sum of its proper divisors (11570042).

20970538 is a wasteful number, since it uses less digits than its factorization.

20970538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361592.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 20970538 is about 4579.3599989518. The cubic root of 20970538 is about 275.7633359461.

The spelling of 20970538 in words is "twenty million, nine hundred seventy thousand, five hundred thirty-eight".