20185919 has 16 divisors (see below), whose sum is σ = 23173920. Its totient is φ = 17418240.

The previous prime is 20185883. The next prime is 20185967. The reversal of 20185919 is 91958102.

It is a cyclic number.

It is not a de Polignac number, because 20185919 - 2¹² = 20181823 is a prime.

It is a super-2 number, since 2×20185919² = 814942651749122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20185969) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53072 + ... + 53450.

It is an arithmetic number, because the mean of its divisors is an integer number (1448370).

Almost surely, 2^20185919 is an apocalyptic number.

20185919 is a deficient number, since it is larger than the sum of its proper divisors (2988001).

20185919 is a wasteful number, since it uses less digits than its factorization.

20185919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 20185919 is about 4492.8742470717. The cubic root of 20185919 is about 272.2802717675.

The spelling of 20185919 in words is "twenty million, one hundred eighty-five thousand, nine hundred nineteen".