20502580 has 36 divisors (see below), whose sum is σ = 50087268. Its totient is φ = 7029120.

The previous prime is 20502571. The next prime is 20502589. The reversal of 20502580 is 8520502.

It is an interprime number because it is at equal distance from previous prime (20502571) and next prime (20502589).

It can be written as a sum of positive squares in 2 ways, for example, as 11102224 + 9400356 = 3332^2 + 3066^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20502589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9481 + ... + 11440.

It is an arithmetic number, because the mean of its divisors is an integer number (1391313).

Almost surely, 2^20502580 is an apocalyptic number.

20502580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20502580 is an abundant number, since it is smaller than the sum of its proper divisors (29584688).

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

20502580 is a wasteful number, since it uses less digits than its factorization.

20502580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20944 (or 20935 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 20502580 is about 4527.9774734422. The cubic root of 20502580 is about 273.6966646855.

The spelling of 20502580 in words is "twenty million, five hundred two thousand, five hundred eighty".