20525577553 has 16 divisors (see below), whose sum is σ = 22258106640. Its totient is φ = 18815360256.

The previous prime is 20525577533. The next prime is 20525577557. The reversal of 20525577553 is 35577552502.

It can be written as a sum of positive squares in 8 ways, for example, as 1050537744 + 19475039809 = 32412^2 + 139553^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20525577553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20525577557) 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, 1419283 + ... + 1433671.

It is an arithmetic number, because the mean of its divisors is an integer number (1391131665).

Almost surely, 2^20525577553 is an apocalyptic number.

It is an amenable number.

20525577553 is a deficient number, since it is larger than the sum of its proper divisors (1732529087).

20525577553 is a wasteful number, since it uses less digits than its factorization.

20525577553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15156.

The product of its (nonzero) digits is 1837500, while the sum is 46.

The spelling of 20525577553 in words is "twenty billion, five hundred twenty-five million, five hundred seventy-seven thousand, five hundred fifty-three".