19228720 has 40 divisors (see below), whose sum is σ = 51094944. Its totient is φ = 6592512.

The previous prime is 19228673. The next prime is 19228721. The reversal of 19228720 is 2782291.

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

It is not an unprimeable number, because it can be changed into a prime (19228721) 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, 16609 + ... + 17728.

Almost surely, 2^19228720 is an apocalyptic number.

19228720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19228720 is an abundant number, since it is smaller than the sum of its proper divisors (31866224).

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

19228720 is a wasteful number, since it uses less digits than its factorization.

19228720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34357 (or 34351 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 19228720 is about 4385.0564420541. The cubic root of 19228720 is about 267.9066281991.

The spelling of 19228720 in words is "nineteen million, two hundred twenty-eight thousand, seven hundred twenty".