20974671 has 12 divisors (see below), whose sum is σ = 31116072. Its totient is φ = 13604976.

The previous prime is 20974663. The next prime is 20974687. The reversal of 20974671 is 17647902.

It is a happy number.

It is not a de Polignac number, because 20974671 - 2³ = 20974663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20974691) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31161 + ... + 31826.

It is an arithmetic number, because the mean of its divisors is an integer number (2593006).

Almost surely, 2^20974671 is an apocalyptic number.

20974671 is a deficient number, since it is larger than the sum of its proper divisors (10141401).

20974671 is a wasteful number, since it uses less digits than its factorization.

20974671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63030 (or 63027 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 20974671 is about 4579.8112406517. The cubic root of 20974671 is about 275.7814511227.

The spelling of 20974671 in words is "twenty million, nine hundred seventy-four thousand, six hundred seventy-one".