19722090 has 16 divisors (see below), whose sum is σ = 47333088. Its totient is φ = 5259216.

The previous prime is 19722089. The next prime is 19722103. The reversal of 19722090 is 9022791.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 657403 = 19722090 / (1 + 9 + 7 + 2 + 2 + 0 + 9 + 0).

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, 328672 + ... + 328731.

It is an arithmetic number, because the mean of its divisors is an integer number (2958318).

Almost surely, 2^19722090 is an apocalyptic number.

19722090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19722090 is an abundant number, since it is smaller than the sum of its proper divisors (27610998).

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

19722090 is a wasteful number, since it uses less digits than its factorization.

19722090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657413.

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 19722090 is about 4440.9559781651. The cubic root of 19722090 is about 270.1786198044.

The spelling of 19722090 in words is "nineteen million, seven hundred twenty-two thousand, ninety".