19957405884 has 192 divisors, whose sum is σ = 54647986176. Its totient is φ = 5613244416.

The previous prime is 19957405883. The next prime is 19957405921. The reversal of 19957405884 is 48850475991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19957405883) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15038829 + ... + 15040155.

It is an arithmetic number, because the mean of its divisors is an integer number (284624928).

Almost surely, 2^19957405884 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 19957405884, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27323993088).

19957405884 is an abundant number, since it is smaller than the sum of its proper divisors (34690580292).

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

19957405884 is a wasteful number, since it uses less digits than its factorization.

19957405884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1524 (or 1522 counting only the distinct ones).

The product of its (nonzero) digits is 14515200, while the sum is 60.

The spelling of 19957405884 in words is "nineteen billion, nine hundred fifty-seven million, four hundred five thousand, eight hundred eighty-four".