20645322 has 16 divisors (see below), whose sum is σ = 41446272. Its totient is φ = 6855840.

The previous prime is 20645321. The next prime is 20645341. The reversal of 20645322 is 22354602.

It is a junction number, because it is equal to n+sod(n) for n = 20645292 and 20645301.

It is not an unprimeable number, because it can be changed into a prime (20645321) 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, 4723 + ... + 7974.

It is an arithmetic number, because the mean of its divisors is an integer number (2590392).

Almost surely, 2^20645322 is an apocalyptic number.

20645322 is an abundant number, since it is smaller than the sum of its proper divisors (20800950).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20645322 is a wasteful number, since it uses less digits than its factorization.

20645322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12973.

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 20645322 is about 4543.7123588537. The cubic root of 20645322 is about 274.3303685514.

Adding to 20645322 its reverse (22354602), we get a palindrome (42999924).

The spelling of 20645322 in words is "twenty million, six hundred forty-five thousand, three hundred twenty-two".