20260040 has 16 divisors (see below), whose sum is σ = 45585180. Its totient is φ = 8104000.

The previous prime is 20260021. The next prime is 20260091. The reversal of 20260040 is 4006202.

It can be written as a sum of positive squares in 2 ways, for example, as 18992164 + 1267876 = 4358^2 + 1126^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20259997 and 20260024.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253211 + ... + 253290.

Almost surely, 2^20260040 is an apocalyptic number.

20260040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20260040 is an abundant number, since it is smaller than the sum of its proper divisors (25325140).

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

20260040 is a wasteful number, since it uses less digits than its factorization.

20260040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506512 (or 506508 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 20260040 is about 4501.1154173160. The cubic root of 20260040 is about 272.6131281260.

Adding to 20260040 its reverse (4006202), we get a palindrome (24266242).

The spelling of 20260040 in words is "twenty million, two hundred sixty thousand, forty".