20972206251584 has 168 divisors, whose sum is σ = 49385305831680. Its totient is φ = 8809051152384.

The previous prime is 20972206251553. The next prime is 20972206251611. The reversal of 20972206251584 is 48515260227902.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30997097 + ... + 31666455.

It is an arithmetic number, because the mean of its divisors is an integer number (293960153760).

Almost surely, 2^{20972206251584} 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 20972206251584, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24692652915840).

20972206251584 is an abundant number, since it is smaller than the sum of its proper divisors (28413099580096).

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

20972206251584 is a wasteful number, since it uses less digits than its factorization.

20972206251584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669585 (or 669568 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 53.

The spelling of 20972206251584 in words is "twenty trillion, nine hundred seventy-two billion, two hundred six million, two hundred fifty-one thousand, five hundred eighty-four".