20630990 has 16 divisors (see below), whose sum is σ = 37189152. Its totient is φ = 8240544.

The previous prime is 20630971. The next prime is 20630999. The reversal of 20630990 is 9903602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20630999) 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, 10247 + ... + 12093.

It is an arithmetic number, because the mean of its divisors is an integer number (2324322).

Almost surely, 2^20630990 is an apocalyptic number.

20630990 is a deficient number, since it is larger than the sum of its proper divisors (16558162).

20630990 is a wasteful number, since it uses less digits than its factorization.

20630990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2971.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 20630990 is about 4542.1349605665. The cubic root of 20630990 is about 274.2668737317.

The spelling of 20630990 in words is "twenty million, six hundred thirty thousand, nine hundred ninety".