20764091 has 2 divisors, whose sum is σ = 20764092. Its totient is φ = 20764090.

The previous prime is 20764063. The next prime is 20764097. The reversal of 20764091 is 19046702.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20764091 is a prime.

It is a super-2 number, since 2×20764091² = 862294950112562, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20764097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10382045 + 10382046.

It is an arithmetic number, because the mean of its divisors is an integer number (10382046).

Almost surely, 2^20764091 is an apocalyptic number.

20764091 is a deficient number, since it is larger than the sum of its proper divisors (1).

20764091 is an equidigital number, since it uses as much as digits as its factorization.

20764091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 20764091 is about 4556.7632152659. The cubic root of 20764091 is about 274.8554215233.

The spelling of 20764091 in words is "twenty million, seven hundred sixty-four thousand, ninety-one".