20745113634 has 672 divisors, whose sum is σ = 64593676800. Its totient is φ = 4938071040.

The previous prime is 20745113611. The next prime is 20745113687. The reversal of 20745113634 is 43631154702.

20745113634 is a `hidden beast` number, since 2 + 0 + 7 + 4 + 5 + 1 + 13 + 634 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 335 ways as a sum of consecutive naturals, for example, 669197199 + ... + 669197229.

Almost surely, 2^20745113634 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20745113634, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32296838400).

20745113634 is an abundant number, since it is smaller than the sum of its proper divisors (43848563166).

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

20745113634 is a wasteful number, since it uses less digits than its factorization.

20745113634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130 (or 108 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The spelling of 20745113634 in words is "twenty billion, seven hundred forty-five million, one hundred thirteen thousand, six hundred thirty-four".