20805010 has 8 divisors (see below), whose sum is σ = 37449036. Its totient is φ = 8322000.

The previous prime is 20804983. The next prime is 20805011. The reversal of 20805010 is 1050802.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17114769 + 3690241 = 4137^2 + 1921^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×20805010² = 865696882200200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20805011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1040241 + ... + 1040260.

Almost surely, 2^20805010 is an apocalyptic number.

20805010 is a deficient number, since it is larger than the sum of its proper divisors (16644026).

20805010 is a wasteful number, since it uses less digits than its factorization.

20805010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2080508.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 20805010 is about 4561.2509249108. The cubic root of 20805010 is about 275.0358520750.

Adding to 20805010 its reverse (1050802), we get a palindrome (21855812).

The spelling of 20805010 in words is "twenty million, eight hundred five thousand, ten".