20308586580 has 144 divisors (see below), whose sum is σ = 66817702224. Its totient is φ = 4972707840.

The previous prime is 20308586567. The next prime is 20308586591. The reversal of 20308586580 is 8568580302.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 3532638096 + 16775948484 = 59436^2 + 129522^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 44524 + ... + 206396.

It is an arithmetic number, because the mean of its divisors is an integer number (464011821).

Almost surely, 2^20308586580 is an apocalyptic number.

20308586580 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 20308586580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33408851112).

20308586580 is an abundant number, since it is smaller than the sum of its proper divisors (46509115644).

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

20308586580 is a wasteful number, since it uses less digits than its factorization.

20308586580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161946 (or 161941 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 45.

The spelling of 20308586580 in words is "twenty billion, three hundred eight million, five hundred eighty-six thousand, five hundred eighty".