20364567257 has 16 divisors (see below), whose sum is σ = 21662413200. Its totient is φ = 19078041600.

The previous prime is 20364567203. The next prime is 20364567299. The reversal of 20364567257 is 75276546302.

It can be written as a sum of positive squares in 8 ways, for example, as 3455205961 + 16909361296 = 58781^2 + 130036^2 .

It is a cyclic number.

It is not a de Polignac number, because 20364567257 - 2¹² = 20364563161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20364567557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3466919 + ... + 3472787.

It is an arithmetic number, because the mean of its divisors is an integer number (1353900825).

Almost surely, 2^20364567257 is an apocalyptic number.

It is an amenable number.

20364567257 is a deficient number, since it is larger than the sum of its proper divisors (1297845943).

20364567257 is a wasteful number, since it uses less digits than its factorization.

20364567257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6796.

The product of its (nonzero) digits is 2116800, while the sum is 47.

The spelling of 20364567257 in words is "twenty billion, three hundred sixty-four million, five hundred sixty-seven thousand, two hundred fifty-seven".