20634173672 has 64 divisors (see below), whose sum is σ = 45753206400. Its totient is φ = 8540421120.

The previous prime is 20634173621. The next prime is 20634173687. The reversal of 20634173672 is 27637143602.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166172 + ... + 262452.

It is an arithmetic number, because the mean of its divisors is an integer number (714893850).

Almost surely, 2^20634173672 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20634173672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22876603200).

20634173672 is an abundant number, since it is smaller than the sum of its proper divisors (25119032728).

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

20634173672 is a wasteful number, since it uses less digits than its factorization.

20634173672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96426 (or 96422 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 41.

The spelling of 20634173672 in words is "twenty billion, six hundred thirty-four million, one hundred seventy-three thousand, six hundred seventy-two".