20217244861572 has 96 divisors (see below), whose sum is σ = 51686368032768. Its totient is φ = 6099786000000.

The previous prime is 20217244861559. The next prime is 20217244861591. The reversal of 20217244861572 is 27516844271202.

It is a super-2 number, since 2×20217244861572² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32504622 + ... + 33120762.

It is an arithmetic number, because the mean of its divisors is an integer number (538399667008).

Almost surely, 2^{20217244861572} is an apocalyptic number.

20217244861572 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20217244861572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25843184016384).

20217244861572 is an abundant number, since it is smaller than the sum of its proper divisors (31469123171196).

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

20217244861572 is a wasteful number, since it uses less digits than its factorization.

20217244861572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617241 (or 617239 counting only the distinct ones).

The product of its (nonzero) digits is 3010560, while the sum is 51.

The spelling of 20217244861572 in words is "twenty trillion, two hundred seventeen billion, two hundred forty-four million, eight hundred sixty-one thousand, five hundred seventy-two".