20974613 has 8 divisors (see below), whose sum is σ = 24085920. Its totient is φ = 18064080.

The previous prime is 20974609. The next prime is 20974619. The reversal of 20974613 is 31647902.

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 20974613 - 2² = 20974609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20974613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20974619) 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, 49970 + ... + 50387.

It is an arithmetic number, because the mean of its divisors is an integer number (3010740).

Almost surely, 2^20974613 is an apocalyptic number.

It is an amenable number.

20974613 is a deficient number, since it is larger than the sum of its proper divisors (3111307).

20974613 is a wasteful number, since it uses less digits than its factorization.

20974613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100387.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 20974613 is about 4579.8049085087. The cubic root of 20974613 is about 275.7811969218.

Subtracting 20974613 from its reverse (31647902), we obtain a square (10673289 = 3267²).

The spelling of 20974613 in words is "twenty million, nine hundred seventy-four thousand, six hundred thirteen".