20826540 has 72 divisors (see below), whose sum is σ = 72203040. Its totient is φ = 4760064.

The previous prime is 20826539. The next prime is 20826557. The reversal of 20826540 is 4562802.

20826540 is a `hidden beast` number, since 2 + 0 + 8 + 2 + 654 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7005 + ... + 9524.

It is an arithmetic number, because the mean of its divisors is an integer number (1002820).

Almost surely, 2^20826540 is an apocalyptic number.

20826540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20826540 is an abundant number, since it is smaller than the sum of its proper divisors (51376500).

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

20826540 is a wasteful number, since it uses less digits than its factorization.

20826540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16551 (or 16546 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 20826540 is about 4563.6104128201. The cubic root of 20826540 is about 275.1306926999.

The spelling of 20826540 in words is "twenty million, eight hundred twenty-six thousand, five hundred forty".