20442619 has 4 divisors (see below), whose sum is σ = 21645144. Its totient is φ = 19240096.

The previous prime is 20442599. The next prime is 20442629. The reversal of 20442619 is 91624402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91624402 = 2 ⋅45812201.

It is a cyclic number.

It is not a de Polignac number, because 20442619 - 2¹¹ = 20440571 is a prime.

It is a super-2 number, since 2×20442619² = 835801343158322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20442629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 601237 + ... + 601270.

It is an arithmetic number, because the mean of its divisors is an integer number (5411286).

Almost surely, 2^20442619 is an apocalyptic number.

20442619 is a deficient number, since it is larger than the sum of its proper divisors (1202525).

20442619 is a wasteful number, since it uses less digits than its factorization.

20442619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1202524.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 20442619 is about 4521.3514572526. The cubic root of 20442619 is about 273.4295901647.

The spelling of 20442619 in words is "twenty million, four hundred forty-two thousand, six hundred nineteen".