19902738856 has 384 divisors, whose sum is σ = 54606182400. Its totient is φ = 6668766720.

The previous prime is 19902738841. The next prime is 19902738871. The reversal of 19902738856 is 65883720991.

It is an interprime number because it is at equal distance from previous prime (19902738841) and next prime (19902738871).

It is a super-2 number, since 2×19902738856² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19902738856.

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, 55439205 + ... + 55439563.

It is an arithmetic number, because the mean of its divisors is an integer number (142203600).

Almost surely, 2^19902738856 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 19902738856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27303091200).

19902738856 is an abundant number, since it is smaller than the sum of its proper divisors (34703443544).

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

19902738856 is a wasteful number, since it uses less digits than its factorization.

19902738856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469 (or 458 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 58.

The spelling of 19902738856 in words is "nineteen billion, nine hundred two million, seven hundred thirty-eight thousand, eight hundred fifty-six".