19870731072 has 42 divisors (see below), whose sum is σ = 56955864498. Its totient is φ = 6623576832.

The previous prime is 19870730977. The next prime is 19870731073. The reversal of 19870731072 is 27013707891.

It can be written as a sum of positive squares in only one way, i.e., 19103662656 + 767068416 = 138216^2 + 27696^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19870731073) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17248323 + ... + 17249474.

Almost surely, 2^19870731072 is an apocalyptic number.

19870731072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19870731072 is an abundant number, since it is smaller than the sum of its proper divisors (37085133426).

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

19870731072 is a wasteful number, since it uses less digits than its factorization.

19870731072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34497815 (or 34497802 counting only the distinct ones).

The product of its (nonzero) digits is 148176, while the sum is 45.

The spelling of 19870731072 in words is "nineteen billion, eight hundred seventy million, seven hundred thirty-one thousand, seventy-two".