19997611120 has 40 divisors (see below), whose sum is σ = 46849389840. Its totient is φ = 7937978880.

The previous prime is 19997611111. The next prime is 19997611129. The reversal of 19997611120 is 2111679991.

It is an interprime number because it is at equal distance from previous prime (19997611111) and next prime (19997611129).

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19997611129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 943605 + ... + 964564.

It is an arithmetic number, because the mean of its divisors is an integer number (1171234746).

Almost surely, 2^19997611120 is an apocalyptic number.

19997611120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19997611120 is an abundant number, since it is smaller than the sum of its proper divisors (26851778720).

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

19997611120 is a wasteful number, since it uses less digits than its factorization.

19997611120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1908313 (or 1908307 counting only the distinct ones).

The product of its (nonzero) digits is 61236, while the sum is 46.

The spelling of 19997611120 in words is "nineteen billion, nine hundred ninety-seven million, six hundred eleven thousand, one hundred twenty".