20645251500474 has 112 divisors (see below), whose sum is σ = 49042953510144. Its totient is φ = 6504879830400.

The previous prime is 20645251500473. The next prime is 20645251500479. The reversal of 20645251500474 is 47400515254602.

20645251500474 is a `hidden beast` number, since 2 + 0 + 6 + 4 + 5 + 25 + 150 + 0 + 474 = 666.

It is not an unprimeable number, because it can be changed into a prime (20645251500473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 3367807 + ... + 7254834.

Almost surely, 2^{20645251500474} is an apocalyptic number.

20645251500474 is an abundant number, since it is smaller than the sum of its proper divisors (28397702009670).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20645251500474 is a wasteful number, since it uses less digits than its factorization.

20645251500474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10622735 (or 10622720 counting only the distinct ones).

The product of its (nonzero) digits is 1344000, while the sum is 45.

The spelling of 20645251500474 in words is "twenty trillion, six hundred forty-five billion, two hundred fifty-one million, five hundred thousand, four hundred seventy-four".