20042889 has 16 divisors (see below), whose sum is σ = 27221760. Its totient is φ = 13115520.

The previous prime is 20042879. The next prime is 20042899. The reversal of 20042889 is 98824002.

It is an interprime number because it is at equal distance from previous prime (20042879) and next prime (20042899).

It is not a de Polignac number, because 20042889 - 2¹³ = 20034697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20042879) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 72219 + ... + 72495.

It is an arithmetic number, because the mean of its divisors is an integer number (1701360).

Almost surely, 2^20042889 is an apocalyptic number.

It is an amenable number.

20042889 is a deficient number, since it is larger than the sum of its proper divisors (7178871).

20042889 is a wasteful number, since it uses less digits than its factorization.

20042889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640.

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 20042889 is about 4476.9285229943. The cubic root of 20042889 is about 271.6356542231.

The spelling of 20042889 in words is "twenty million, forty-two thousand, eight hundred eighty-nine".