20586540 has 48 divisors (see below), whose sum is σ = 62078688. Its totient is φ = 5067264.

The previous prime is 20586539. The next prime is 20586547. The reversal of 20586540 is 4568502.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 20586498 and 20586507.

It is not an unprimeable number, because it can be changed into a prime (20586547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12417 + ... + 13976.

It is an arithmetic number, because the mean of its divisors is an integer number (1293306).

Almost surely, 2^20586540 is an apocalyptic number.

20586540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20586540 is an abundant number, since it is smaller than the sum of its proper divisors (41492148).

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

20586540 is a wasteful number, since it uses less digits than its factorization.

20586540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26418 (or 26416 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 20586540 is about 4537.2392487062. The cubic root of 20586540 is about 274.0697604178.

The spelling of 20586540 in words is "twenty million, five hundred eighty-six thousand, five hundred forty".