20974769 has 2 divisors, whose sum is σ = 20974770. Its totient is φ = 20974768.

The previous prime is 20974757. The next prime is 20974813. The reversal of 20974769 is 96747902.

It is an a-pointer prime, because the next prime (20974813) can be obtained adding 20974769 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11641744 + 9333025 = 3412^2 + 3055^2 .

It is a cyclic number.

It is not a de Polignac number, because 20974769 - 2²⁴ = 4197553 is a prime.

It is a super-2 number, since 2×20974769² = 879881869206722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20974169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10487384 + 10487385.

It is an arithmetic number, because the mean of its divisors is an integer number (10487385).

Almost surely, 2^20974769 is an apocalyptic number.

It is an amenable number.

20974769 is a deficient number, since it is larger than the sum of its proper divisors (1).

20974769 is an equidigital number, since it uses as much as digits as its factorization.

20974769 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 190512, while the sum is 44.

The square root of 20974769 is about 4579.8219397701. The cubic root of 20974769 is about 275.7818806335.

The spelling of 20974769 in words is "twenty million, nine hundred seventy-four thousand, seven hundred sixty-nine".