20390398 has 16 divisors (see below), whose sum is σ = 35267040. Its totient is φ = 8660736.

The previous prime is 20390353. The next prime is 20390399. The reversal of 20390398 is 89309302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20390399) 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, 4863 + ... + 8026.

It is an arithmetic number, because the mean of its divisors is an integer number (2204190).

Almost surely, 2^20390398 is an apocalyptic number.

20390398 is a deficient number, since it is larger than the sum of its proper divisors (14876642).

20390398 is a wasteful number, since it uses less digits than its factorization.

20390398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13011.

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

The square root of 20390398 is about 4515.5728318786. The cubic root of 20390398 is about 273.1965648633.

It can be divided in two parts, 203 and 90398, that added together give a square (90601 = 301²).

The spelling of 20390398 in words is "twenty million, three hundred ninety thousand, three hundred ninety-eight".