20452390 has 32 divisors (see below), whose sum is σ = 42364224. Its totient is φ = 6963840.

The previous prime is 20452363. The next prime is 20452427. The reversal of 20452390 is 9325402.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10060 + ... + 11920.

It is an arithmetic number, because the mean of its divisors is an integer number (1323882).

Almost surely, 2^20452390 is an apocalyptic number.

20452390 is an abundant number, since it is smaller than the sum of its proper divisors (21911834).

20452390 is a wasteful number, since it uses less digits than its factorization.

20452390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2032.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 20452390 is about 4522.4318679224. The cubic root of 20452390 is about 273.4731471240.

Adding to 20452390 its reverse (9325402), we get a palindrome (29777792).

The spelling of 20452390 in words is "twenty million, four hundred fifty-two thousand, three hundred ninety".