20974663 has 2 divisors, whose sum is σ = 20974664. Its totient is φ = 20974662.

The previous prime is 20974637. The next prime is 20974687. The reversal of 20974663 is 36647902.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20974663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20974633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10487331 + 10487332.

It is an arithmetic number, because the mean of its divisors is an integer number (10487332).

Almost surely, 2^20974663 is an apocalyptic number.

20974663 is a deficient number, since it is larger than the sum of its proper divisors (1).

20974663 is an equidigital number, since it uses as much as digits as its factorization.

20974663 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 37.

The square root of 20974663 is about 4579.8103672532. The cubic root of 20974663 is about 275.7814160605.

The spelling of 20974663 in words is "twenty million, nine hundred seventy-four thousand, six hundred sixty-three".