20383990 has 16 divisors (see below), whose sum is σ = 40026960. Its totient is φ = 7412320.

The previous prime is 20383963. The next prime is 20383991. The reversal of 20383990 is 9938302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20383991) 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, 92545 + ... + 92764.

It is an arithmetic number, because the mean of its divisors is an integer number (2501685).

Almost surely, 2^20383990 is an apocalyptic number.

20383990 is a deficient number, since it is larger than the sum of its proper divisors (19642970).

20383990 is a wasteful number, since it uses less digits than its factorization.

20383990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185327.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 20383990 is about 4514.8632315941. The cubic root of 20383990 is about 273.1679431070.

The spelling of 20383990 in words is "twenty million, three hundred eighty-three thousand, nine hundred ninety".