20827990 has 16 divisors (see below), whose sum is σ = 39463920. Its totient is φ = 7892640.

The previous prime is 20827987. The next prime is 20827999. The reversal of 20827990 is 9972802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20827999) 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, 54621 + ... + 55000.

It is an arithmetic number, because the mean of its divisors is an integer number (2466495).

Almost surely, 2^20827990 is an apocalyptic number.

20827990 is a deficient number, since it is larger than the sum of its proper divisors (18635930).

20827990 is a wasteful number, since it uses less digits than its factorization.

20827990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109647.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 20827990 is about 4563.7692755002. The cubic root of 20827990 is about 275.1370776658.

The spelling of 20827990 in words is "twenty million, eight hundred twenty-seven thousand, nine hundred ninety".