20466540 has 96 divisors (see below), whose sum is σ = 64350720. Its totient is φ = 5400000.

The previous prime is 20466497. The next prime is 20466577. The reversal of 20466540 is 4566402.

It is a happy number.

20466540 is a `hidden beast` number, since 2 + 0 + 4 + 6 + 654 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 81415 + ... + 81665.

It is an arithmetic number, because the mean of its divisors is an integer number (670320).

Almost surely, 2^20466540 is an apocalyptic number.

20466540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20466540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32175360).

20466540 is an abundant number, since it is smaller than the sum of its proper divisors (43884180).

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

20466540 is a wasteful number, since it uses less digits than its factorization.

20466540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420 (or 412 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 20466540 is about 4523.9960212184. The cubic root of 20466540 is about 273.5362001131.

The spelling of 20466540 in words is "twenty million, four hundred sixty-six thousand, five hundred forty".