20447739789960 has 512 divisors, whose sum is σ = 73436037120000. Its totient is φ = 4551340824576.

The previous prime is 20447739789959. The next prime is 20447739789979. The reversal of 20447739789960 is 6998793774402.

It is a super-2 number, since 2×20447739789960² (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 127 ways as a sum of consecutive naturals, for example, 237326649 + ... + 237412791.

It is an arithmetic number, because the mean of its divisors is an integer number (143429760000).

Almost surely, 2^{20447739789960} is an apocalyptic number.

20447739789960 is a gapful number since it is divisible by the number (20) 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 20447739789960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36718018560000).

20447739789960 is an abundant number, since it is smaller than the sum of its proper divisors (52988297330040).

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

20447739789960 is a wasteful number, since it uses less digits than its factorization.

20447739789960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86330 (or 86312 counting only the distinct ones).

The product of its (nonzero) digits is 1152216576, while the sum is 75.

The spelling of 20447739789960 in words is "twenty trillion, four hundred forty-seven billion, seven hundred thirty-nine million, seven hundred eighty-nine thousand, nine hundred sixty".