20974243 has 4 divisors (see below), whose sum is σ = 22208040. Its totient is φ = 19740448.

The previous prime is 20974241. The next prime is 20974249. The reversal of 20974243 is 34247902.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20974243 - 2¹ = 20974241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20974241) 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, 616873 + ... + 616906.

It is an arithmetic number, because the mean of its divisors is an integer number (5552010).

Almost surely, 2^20974243 is an apocalyptic number.

20974243 is a deficient number, since it is larger than the sum of its proper divisors (1233797).

20974243 is a wasteful number, since it uses less digits than its factorization.

20974243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1233796.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 20974243 is about 4579.7645135967. The cubic root of 20974243 is about 275.7795752846.

The spelling of 20974243 in words is "twenty million, nine hundred seventy-four thousand, two hundred forty-three".