20764577 has 2 divisors, whose sum is σ = 20764578. Its totient is φ = 20764576.

The previous prime is 20764567. The next prime is 20764591. The reversal of 20764577 is 77546702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13957696 + 6806881 = 3736^2 + 2609^2 .

It is a cyclic number.

It is not a de Polignac number, because 20764577 - 2¹⁴ = 20748193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20764577.

It is not a weakly prime, because it can be changed into another prime (20764507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10382288 + 10382289.

It is an arithmetic number, because the mean of its divisors is an integer number (10382289).

Almost surely, 2^20764577 is an apocalyptic number.

It is an amenable number.

20764577 is a deficient number, since it is larger than the sum of its proper divisors (1).

20764577 is an equidigital number, since it uses as much as digits as its factorization.

20764577 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82320, while the sum is 38.

The square root of 20764577 is about 4556.8165422804. The cubic root of 20764577 is about 274.8575659095.

The spelling of 20764577 in words is "twenty million, seven hundred sixty-four thousand, five hundred seventy-seven".