19900120 has 32 divisors (see below), whose sum is σ = 44910000. Its totient is φ = 7936128.

The previous prime is 19900057. The next prime is 19900123. The reversal of 19900120 is 2100991.

It is a junction number, because it is equal to n+sod(n) for n = 19900091 and 19900100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19900123) 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, 19462 + ... + 20458.

Almost surely, 2^19900120 is an apocalyptic number.

19900120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19900120 is an abundant number, since it is smaller than the sum of its proper divisors (25009880).

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

19900120 is a wasteful number, since it uses less digits than its factorization.

19900120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1507 (or 1503 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 19900120 is about 4460.9550546940. The cubic root of 19900120 is about 270.9891473166.

The spelling of 19900120 in words is "nineteen million, nine hundred thousand, one hundred twenty".