20974213 has 8 divisors (see below), whose sum is σ = 22821848. Its totient is φ = 19160064.

The previous prime is 20974211. The next prime is 20974231. The reversal of 20974213 is 31247902.

It can be written as a sum of positive squares in 4 ways, for example, as 16129 + 20958084 = 127^2 + 4578^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20974213 - 2¹ = 20974211 is a prime.

It is a super-2 number, since 2×20974213² = 879835221938738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20974211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7056 + ... + 9577.

It is an arithmetic number, because the mean of its divisors is an integer number (2852731).

Almost surely, 2^20974213 is an apocalyptic number.

It is an amenable number.

20974213 is a deficient number, since it is larger than the sum of its proper divisors (1847635).

20974213 is a wasteful number, since it uses less digits than its factorization.

20974213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16743.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 20974213 is about 4579.7612383180. The cubic root of 20974213 is about 275.7794437996.

The spelling of 20974213 in words is "twenty million, nine hundred seventy-four thousand, two hundred thirteen".