20449390 has 16 divisors (see below), whose sum is σ = 39640608. Its totient is φ = 7550496.

The previous prime is 20449343. The next prime is 20449391. The reversal of 20449390 is 9394402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20449391) 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, 78522 + ... + 78781.

It is an arithmetic number, because the mean of its divisors is an integer number (2477538).

Almost surely, 2^20449390 is an apocalyptic number.

20449390 is a deficient number, since it is larger than the sum of its proper divisors (19191218).

20449390 is a wasteful number, since it uses less digits than its factorization.

20449390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157323.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 20449390 is about 4522.1001758033. The cubic root of 20449390 is about 273.4597752629.

It can be divided in two parts, 204 and 49390, that added together give a palindrome (49594).

The spelling of 20449390 in words is "twenty million, four hundred forty-nine thousand, three hundred ninety".