20185690 has 32 divisors (see below), whose sum is σ = 41681664. Its totient is φ = 6894720.

The previous prime is 20185673. The next prime is 20185691. The reversal of 20185690 is 9658102.

It is a super-2 number, since 2×20185690² = 814924161552200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20185691) 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, 31675 + ... + 32305.

It is an arithmetic number, because the mean of its divisors is an integer number (1302552).

Almost surely, 2^20185690 is an apocalyptic number.

20185690 is an abundant number, since it is smaller than the sum of its proper divisors (21495974).

20185690 is a wasteful number, since it uses less digits than its factorization.

20185690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1102.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 20185690 is about 4492.8487621998. The cubic root of 20185690 is about 272.2792421320.

The spelling of 20185690 in words is "twenty million, one hundred eighty-five thousand, six hundred ninety".