20836540 has 24 divisors (see below), whose sum is σ = 46060560. Its totient is φ = 7895808.

The previous prime is 20836537. The next prime is 20836561. The reversal of 20836540 is 4563802.

It is a super-2 number, since 2×20836540² = 868322798343200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20836499 and 20836508.

It is a congruent number.

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, 27037 + ... + 27796.

It is an arithmetic number, because the mean of its divisors is an integer number (1919190).

Almost surely, 2^20836540 is an apocalyptic number.

20836540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20836540 is an abundant number, since it is smaller than the sum of its proper divisors (25224020).

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

20836540 is a wasteful number, since it uses less digits than its factorization.

20836540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54861 (or 54859 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 20836540 is about 4564.7059050940. The cubic root of 20836540 is about 275.1747209237.

The spelling of 20836540 in words is "twenty million, eight hundred thirty-six thousand, five hundred forty".