20645463457674 has 192 divisors, whose sum is σ = 52070617497600. Its totient is φ = 5842567272960.

The previous prime is 20645463457643. The next prime is 20645463457741. The reversal of 20645463457674 is 47675436454602.

20645463457674 is a `hidden beast` number, since 2 + 0 + 6 + 4 + 54 + 6 + 3 + 4 + 576 + 7 + 4 = 666.

It is a super-2 number, since 2×20645463457674² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 245787087 + ... + 245871069.

It is an arithmetic number, because the mean of its divisors is an integer number (271201132800).

Almost surely, 2^{20645463457674} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20645463457674, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26035308748800).

20645463457674 is an abundant number, since it is smaller than the sum of its proper divisors (31425154039926).

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

20645463457674 is a wasteful number, since it uses less digits than its factorization.

20645463457674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84585 (or 84582 counting only the distinct ones).

The product of its (nonzero) digits is 406425600, while the sum is 63.

The spelling of 20645463457674 in words is "twenty trillion, six hundred forty-five billion, four hundred sixty-three million, four hundred fifty-seven thousand, six hundred seventy-four".