19737970494 has 64 divisors (see below), whose sum is σ = 44319260160. Its totient is φ = 5807617920.

The previous prime is 19737970489. The next prime is 19737970529. The reversal of 19737970494 is 49407973791.

It is a congruent number.

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, 1220292 + ... + 1236360.

It is an arithmetic number, because the mean of its divisors is an integer number (692488440).

Almost surely, 2^19737970494 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19737970494, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22159630080).

19737970494 is an abundant number, since it is smaller than the sum of its proper divisors (24581289666).

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

19737970494 is a wasteful number, since it uses less digits than its factorization.

19737970494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16625.

The product of its (nonzero) digits is 12002256, while the sum is 60.

The spelling of 19737970494 in words is "nineteen billion, seven hundred thirty-seven million, nine hundred seventy thousand, four hundred ninety-four".