20974657 has 8 divisors (see below), whose sum is σ = 23440032. Its totient is φ = 18602400.

The previous prime is 20974637. The next prime is 20974663. The reversal of 20974657 is 75647902.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20974657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20974637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22803 + ... + 23704.

It is an arithmetic number, because the mean of its divisors is an integer number (2930004).

Almost surely, 2^20974657 is an apocalyptic number.

It is an amenable number.

20974657 is a deficient number, since it is larger than the sum of its proper divisors (2465375).

20974657 is a wasteful number, since it uses less digits than its factorization.

20974657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46559.

The product of its (nonzero) digits is 105840, while the sum is 40.

The square root of 20974657 is about 4579.8097122042. The cubic root of 20974657 is about 275.7813897639.

The spelling of 20974657 in words is "twenty million, nine hundred seventy-four thousand, six hundred fifty-seven".