20266580 has 12 divisors (see below), whose sum is σ = 42559860. Its totient is φ = 8106624.

The previous prime is 20266577. The next prime is 20266583. The reversal of 20266580 is 8566202.

It is an interprime number because it is at equal distance from previous prime (20266577) and next prime (20266583).

It can be written as a sum of positive squares in 2 ways, for example, as 3341584 + 16924996 = 1828^2 + 4114^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20266583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 506645 + ... + 506684.

It is an arithmetic number, because the mean of its divisors is an integer number (3546655).

Almost surely, 2^20266580 is an apocalyptic number.

20266580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20266580 is an abundant number, since it is smaller than the sum of its proper divisors (22293280).

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

20266580 is a wasteful number, since it uses less digits than its factorization.

20266580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1013338 (or 1013336 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 20266580 is about 4501.8418452895. The cubic root of 20266580 is about 272.6424584078.

The spelling of 20266580 in words is "twenty million, two hundred sixty-six thousand, five hundred eighty".