20940830 has 16 divisors (see below), whose sum is σ = 38405664. Its totient is φ = 8218080.

The previous prime is 20940823. The next prime is 20940839. The reversal of 20940830 is 3804902.

It is a super-2 number, since 2×20940830² = 877036722177800, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20940830.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20940839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19226 + ... + 20285.

It is an arithmetic number, because the mean of its divisors is an integer number (2400354).

Almost surely, 2^20940830 is an apocalyptic number.

20940830 is a deficient number, since it is larger than the sum of its proper divisors (17464834).

20940830 is a wasteful number, since it uses less digits than its factorization.

20940830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39571.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 20940830 is about 4576.1151646347. The cubic root of 20940830 is about 275.6330539790.

The spelling of 20940830 in words is "twenty million, nine hundred forty thousand, eight hundred thirty".