20769577 has 2 divisors, whose sum is σ = 20769578. Its totient is φ = 20769576.

The previous prime is 20769571. The next prime is 20769589. The reversal of 20769577 is 77596702.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20693401 + 76176 = 4549^2 + 276^2 .

It is a cyclic number.

It is not a de Polignac number, because 20769577 - 2¹¹ = 20767529 is a prime.

It is not a weakly prime, because it can be changed into another prime (20769571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10384788 + 10384789.

It is an arithmetic number, because the mean of its divisors is an integer number (10384789).

Almost surely, 2^20769577 is an apocalyptic number.

It is an amenable number.

20769577 is a deficient number, since it is larger than the sum of its proper divisors (1).

20769577 is an equidigital number, since it uses as much as digits as its factorization.

20769577 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 185220, while the sum is 43.

The square root of 20769577 is about 4557.3651378840. The cubic root of 20769577 is about 274.8796255537.

The spelling of 20769577 in words is "twenty million, seven hundred sixty-nine thousand, five hundred seventy-seven".