20645107225 has 24 divisors (see below), whose sum is σ = 26097204672. Its totient is φ = 16195608000.

The previous prime is 20645107201. The next prime is 20645107237. The reversal of 20645107225 is 52270154602.

It is not a de Polignac number, because 20645107225 - 2¹⁷ = 20644976153 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3525550 + ... + 3531400.

It is an arithmetic number, because the mean of its divisors is an integer number (1087383528).

Almost surely, 2^20645107225 is an apocalyptic number.

20645107225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20645107225 is a deficient number, since it is larger than the sum of its proper divisors (5452097447).

20645107225 is a wasteful number, since it uses less digits than its factorization.

20645107225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8577 (or 8572 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 34.

The spelling of 20645107225 in words is "twenty billion, six hundred forty-five million, one hundred seven thousand, two hundred twenty-five".