20645346 has 16 divisors (see below), whose sum is σ = 41356224. Its totient is φ = 6870864.

The previous prime is 20645341. The next prime is 20645347. The reversal of 20645346 is 64354602.

It is a super-2 number, since 2×20645346² = 852460622919432, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20645341) 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, 1996 + ... + 6728.

It is an arithmetic number, because the mean of its divisors is an integer number (2584764).

Almost surely, 2^20645346 is an apocalyptic number.

20645346 is an abundant number, since it is smaller than the sum of its proper divisors (20710878).

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

20645346 is a wasteful number, since it uses less digits than its factorization.

20645346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5465.

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 20645346 is about 4543.7149998652. The cubic root of 20645346 is about 274.3304748535.

Adding to 20645346 its reverse (64354602), we get a palindrome (84999948).

The spelling of 20645346 in words is "twenty million, six hundred forty-five thousand, three hundred forty-six".