19722530 has 16 divisors (see below), whose sum is σ = 35551224. Its totient is φ = 7877760.

The previous prime is 19722529. The next prime is 19722557. The reversal of 19722530 is 3522791.

It can be written as a sum of positive squares in 4 ways, for example, as 19722481 + 49 = 4441^2 + 7^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19722493 and 19722502.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12464 + ... + 13956.

Almost surely, 2^19722530 is an apocalyptic number.

19722530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19722530 is a deficient number, since it is larger than the sum of its proper divisors (15828694).

19722530 is a wasteful number, since it uses less digits than its factorization.

19722530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2821.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 19722530 is about 4441.0055167721. The cubic root of 19722530 is about 270.1806290186.

The spelling of 19722530 in words is "nineteen million, seven hundred twenty-two thousand, five hundred thirty".