20500690 has 16 divisors (see below), whose sum is σ = 42172992. Its totient is φ = 7028784.

The previous prime is 20500687. The next prime is 20500699. The reversal of 20500690 is 9600502.

It is a super-2 number, since 2×20500690² = 840556580952200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20500699) 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 7 ways as a sum of consecutive naturals, for example, 146364 + ... + 146503.

It is an arithmetic number, because the mean of its divisors is an integer number (2635812).

Almost surely, 2^20500690 is an apocalyptic number.

20500690 is an abundant number, since it is smaller than the sum of its proper divisors (21672302).

20500690 is a wasteful number, since it uses less digits than its factorization.

20500690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292881.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 20500690 is about 4527.7687661805. The cubic root of 20500690 is about 273.6882543197.

The spelling of 20500690 in words is "twenty million, five hundred thousand, six hundred ninety".