20825198965 has 4 divisors (see below), whose sum is σ = 24990238764. Its totient is φ = 16660159168.

The previous prime is 20825198963. The next prime is 20825198969. The reversal of 20825198965 is 56989152802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11432100241 + 9393098724 = 106921^2 + 96918^2 .

It is a cyclic number.

It is not a de Polignac number, because 20825198965 - 2¹ = 20825198963 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20825198963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2082519892 + ... + 2082519901.

It is an arithmetic number, because the mean of its divisors is an integer number (6247559691).

Almost surely, 2^20825198965 is an apocalyptic number.

It is an amenable number.

20825198965 is a deficient number, since it is larger than the sum of its proper divisors (4165039799).

20825198965 is an equidigital number, since it uses as much as digits as its factorization.

20825198965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4165039798.

The product of its (nonzero) digits is 3110400, while the sum is 55.

The spelling of 20825198965 in words is "twenty billion, eight hundred twenty-five million, one hundred ninety-eight thousand, nine hundred sixty-five".