19900000620 has 60 divisors (see below), whose sum is σ = 62427044064. Its totient is φ = 5306666400.

The previous prime is 19900000619. The next prime is 19900000667. The reversal of 19900000620 is 2600000991.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6140356 + ... + 6143595.

Almost surely, 2^19900000620 is an apocalyptic number.

19900000620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19900000620 is an abundant number, since it is smaller than the sum of its proper divisors (42527043444).

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

19900000620 is a wasteful number, since it uses less digits than its factorization.

19900000620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12283972 (or 12283961 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The spelling of 19900000620 in words is "nineteen billion, nine hundred million, six hundred twenty", and thus it is an aban number.