20974507 has 4 divisors (see below), whose sum is σ = 21651136. Its totient is φ = 20297880.

The previous prime is 20974501. The next prime is 20974519. The reversal of 20974507 is 70547902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70547902 = 2 ⋅35273951.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20974507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20974501) 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, 338268 + ... + 338329.

It is an arithmetic number, because the mean of its divisors is an integer number (5412784).

Almost surely, 2^20974507 is an apocalyptic number.

20974507 is a deficient number, since it is larger than the sum of its proper divisors (676629).

20974507 is an equidigital number, since it uses as much as digits as its factorization.

20974507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676628.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 20974507 is about 4579.7933359487. The cubic root of 20974507 is about 275.7807323466.

The spelling of 20974507 in words is "twenty million, nine hundred seventy-four thousand, five hundred seven".