20102690 has 16 divisors (see below), whose sum is σ = 37758528. Its totient is φ = 7691376.

The previous prime is 20102689. The next prime is 20102701. The reversal of 20102690 is 9620102.

It is a super-2 number, since 2×20102690² = 808236290472200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43472 + ... + 43931.

It is an arithmetic number, because the mean of its divisors is an integer number (2359908).

Almost surely, 2^20102690 is an apocalyptic number.

20102690 is a deficient number, since it is larger than the sum of its proper divisors (17655838).

20102690 is a wasteful number, since it uses less digits than its factorization.

20102690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87433.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 20102690 is about 4483.6023463282. The cubic root of 20102690 is about 271.9055413789.

Adding to 20102690 its reverse (9620102), we get a palindrome (29722792).

The spelling of 20102690 in words is "twenty million, one hundred two thousand, six hundred ninety".