20247500442645 has 48 divisors (see below), whose sum is σ = 40116091466880. Its totient is φ = 9254440835712.

The previous prime is 20247500442613. The next prime is 20247500442661. The reversal of 20247500442645 is 54624400574202.

20247500442645 is a `hidden beast` number, since 2 + 0 + 2 + 47 + 500 + 4 + 42 + 64 + 5 = 666.

It is not a de Polignac number, because 20247500442645 - 2⁵ = 20247500442613 is a prime.

It is a super-2 number, since 2×20247500442645² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20247500442645.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 3540714 + ... + 7282283.

It is an arithmetic number, because the mean of its divisors is an integer number (835751905560).

Almost surely, 2^{20247500442645} is an apocalyptic number.

It is an amenable number.

20247500442645 is a deficient number, since it is larger than the sum of its proper divisors (19868591024235).

20247500442645 is a wasteful number, since it uses less digits than its factorization.

20247500442645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10828954 (or 10828951 counting only the distinct ones).

The product of its (nonzero) digits is 2150400, while the sum is 45.

The spelling of 20247500442645 in words is "twenty trillion, two hundred forty-seven billion, five hundred million, four hundred forty-two thousand, six hundred forty-five".