19711902420 has 288 divisors, whose sum is σ = 73155403776. Its totient is φ = 4360003200.

The previous prime is 19711902383. The next prime is 19711902449. The reversal of 19711902420 is 2420911791.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1045275 + ... + 1063965.

Almost surely, 2^19711902420 is an apocalyptic number.

19711902420 is a gapful number since it is divisible by the number (10) 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 19711902420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36577701888).

19711902420 is an abundant number, since it is smaller than the sum of its proper divisors (53443501356).

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

19711902420 is a wasteful number, since it uses less digits than its factorization.

19711902420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18753 (or 18739 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The spelling of 19711902420 in words is "nineteen billion, seven hundred eleven million, nine hundred two thousand, four hundred twenty".