20764487 has 2 divisors, whose sum is σ = 20764488. Its totient is φ = 20764486.

The previous prime is 20764427. The next prime is 20764507. The reversal of 20764487 is 78446702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20764487 - 2⁸ = 20764231 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20764487.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20764427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10382243 + 10382244.

It is an arithmetic number, because the mean of its divisors is an integer number (10382244).

Almost surely, 2^20764487 is an apocalyptic number.

20764487 is a deficient number, since it is larger than the sum of its proper divisors (1).

20764487 is an equidigital number, since it uses as much as digits as its factorization.

20764487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75264, while the sum is 38.

The square root of 20764487 is about 4556.8066669544. The cubic root of 20764487 is about 274.8571688035.

The spelling of 20764487 in words is "twenty million, seven hundred sixty-four thousand, four hundred eighty-seven".