19422720 has 160 divisors (see below), whose sum is σ = 69236640. Its totient is φ = 5160960.

The previous prime is 19422719. The next prime is 19422757. The reversal of 19422720 is 2722491.

It is a tau number, because it is divible by the number of its divisors (160).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68980 + ... + 69260.

It is an arithmetic number, because the mean of its divisors is an integer number (432729).

Almost surely, 2^19422720 is an apocalyptic number.

19422720 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 19422720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34618320).

19422720 is an abundant number, since it is smaller than the sum of its proper divisors (49813920).

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

19422720 is an equidigital number, since it uses as much as digits as its factorization.

19422720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313 (or 291 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 19422720 is about 4407.1215095570. The cubic root of 19422720 is about 268.8045917583.

The spelling of 19422720 in words is "nineteen million, four hundred twenty-two thousand, seven hundred twenty".