19220645 has 8 divisors (see below), whose sum is σ = 23099256. Its totient is φ = 15353536.

The previous prime is 19220633. The next prime is 19220671. The reversal of 19220645 is 54602291.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 332929 + 18887716 = 577^2 + 4346^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19220645 - 2¹⁸ = 18958501 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 1379 + ... + 6351.

It is an arithmetic number, because the mean of its divisors is an integer number (2887407).

Almost surely, 2^19220645 is an apocalyptic number.

It is an amenable number.

19220645 is a deficient number, since it is larger than the sum of its proper divisors (3878611).

19220645 is an equidigital number, since it uses as much as digits as its factorization.

19220645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5751.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 19220645 is about 4384.1356046546. The cubic root of 19220645 is about 267.8691209543.

The spelling of 19220645 in words is "nineteen million, two hundred twenty thousand, six hundred forty-five".