19722985 has 4 divisors (see below), whose sum is σ = 23667588. Its totient is φ = 15778384.

The previous prime is 19722971. The next prime is 19723001. The reversal of 19722985 is 58922791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58922791 = 467 ⋅126173.

It can be written as a sum of positive squares in 2 ways, for example, as 4575321 + 15147664 = 2139^2 + 3892^2 .

It is a cyclic number.

It is not a de Polignac number, because 19722985 - 2⁹ = 19722473 is a prime.

It is a super-2 number, since 2×19722985² = 777992274620450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1972294 + ... + 1972303.

It is an arithmetic number, because the mean of its divisors is an integer number (5916897).

Almost surely, 2^19722985 is an apocalyptic number.

It is an amenable number.

19722985 is a deficient number, since it is larger than the sum of its proper divisors (3944603).

19722985 is an equidigital number, since it uses as much as digits as its factorization.

19722985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3944602.

The product of its digits is 90720, while the sum is 43.

The square root of 19722985 is about 4441.0567436141. The cubic root of 19722985 is about 270.1827066973.

The spelling of 19722985 in words is "nineteen million, seven hundred twenty-two thousand, nine hundred eighty-five".