20161889 has 8 divisors (see below), whose sum is σ = 22410432. Its totient is φ = 17982640.

The previous prime is 20161877. The next prime is 20161901. The reversal of 20161889 is 98816102.

20161889 = T₄₂₂ + T₄₂₃ + ... + T₅₈₀.

It is an interprime number because it is at equal distance from previous prime (20161877) and next prime (20161901).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20161889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20161859) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16709 + ... + 17874.

It is an arithmetic number, because the mean of its divisors is an integer number (2801304).

Almost surely, 2^20161889 is an apocalyptic number.

It is an amenable number.

20161889 is a deficient number, since it is larger than the sum of its proper divisors (2248543).

20161889 is a wasteful number, since it uses less digits than its factorization.

20161889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34647.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 20161889 is about 4490.1992160705. The cubic root of 20161889 is about 272.1721849877.

The spelling of 20161889 in words is "twenty million, one hundred sixty-one thousand, eight hundred eighty-nine".