20974097 has 4 divisors (see below), whose sum is σ = 21010416. Its totient is φ = 20937780.

The previous prime is 20974049. The next prime is 20974111. The reversal of 20974097 is 79047902.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20974097 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20974097.

It is not an unprimeable number, because it can be changed into a prime (20974297) 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, 17279 + ... + 18452.

It is an arithmetic number, because the mean of its divisors is an integer number (5252604).

Almost surely, 2^20974097 is an apocalyptic number.

It is an amenable number.

20974097 is a deficient number, since it is larger than the sum of its proper divisors (36319).

20974097 is an equidigital number, since it uses as much as digits as its factorization.

20974097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36318.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 20974097 is about 4579.7485738848. The cubic root of 20974097 is about 275.7789353900.

The spelling of 20974097 in words is "twenty million, nine hundred seventy-four thousand, ninety-seven".