20045810 has 16 divisors (see below), whose sum is σ = 36173952. Its totient is φ = 7998000.

The previous prime is 20045791. The next prime is 20045827. The reversal of 20045810 is 1854002.

It is a super-2 number, since 2×20045810² = 803668997112200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1985 + ... + 6635.

It is an arithmetic number, because the mean of its divisors is an integer number (2260872).

Almost surely, 2^20045810 is an apocalyptic number.

20045810 is a deficient number, since it is larger than the sum of its proper divisors (16128142).

20045810 is a wasteful number, since it uses less digits than its factorization.

20045810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5089.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 20045810 is about 4477.2547392347. The cubic root of 20045810 is about 271.6488494134.

Adding to 20045810 its reverse (1854002), we get a palindrome (21899812).

The spelling of 20045810 in words is "twenty million, forty-five thousand, eight hundred ten".