19912320 has 96 divisors (see below), whose sum is σ = 68779620. Its totient is φ = 5308416.

The previous prime is 19912313. The next prime is 19912331. The reversal of 19912320 is 2321991.

It can be written as a sum of positive squares in 2 ways, for example, as 16842816 + 3069504 = 4104^2 + 1752^2 .

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4032 + ... + 7488.

Almost surely, 2^19912320 is an apocalyptic number.

19912320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19912320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34389810).

19912320 is an abundant number, since it is smaller than the sum of its proper divisors (48867300).

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

19912320 is a wasteful number, since it uses less digits than its factorization.

19912320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3482 (or 3467 counting only the distinct ones).

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

The square root of 19912320 is about 4462.3222653681. The cubic root of 19912320 is about 271.0445136866.

The spelling of 19912320 in words is "nineteen million, nine hundred twelve thousand, three hundred twenty".