19619920 has 40 divisors (see below), whose sum is σ = 47604096. Its totient is φ = 7506048.

The previous prime is 19619909. The next prime is 19619939. The reversal of 19619920 is 2991691.

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

It is a self number, because there is not a number n which added to its sum of digits gives 19619920.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3492 + ... + 7171.

Almost surely, 2^19619920 is an apocalyptic number.

19619920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19619920 is an abundant number, since it is smaller than the sum of its proper divisors (27984176).

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

19619920 is a wasteful number, since it uses less digits than its factorization.

19619920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10699 (or 10693 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 37.

The square root of 19619920 is about 4429.4378875880. The cubic root of 19619920 is about 269.7112596872.

It can be divided in two parts, 1961 and 9920, that added together give a square (11881 = 109²).

The spelling of 19619920 in words is "nineteen million, six hundred nineteen thousand, nine hundred twenty".