20308080 has 160 divisors (see below), whose sum is σ = 70995456. Its totient is φ = 4764672.

The previous prime is 20308073. The next prime is 20308097. The reversal of 20308080 is 8080302.

It is a super-2 number, since 2×20308080² = 824836226572800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 71619 + ... + 71901.

Almost surely, 2^20308080 is an apocalyptic number.

20308080 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 20308080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35497728).

20308080 is an abundant number, since it is smaller than the sum of its proper divisors (50687376).

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

20308080 is a wasteful number, since it uses less digits than its factorization.

20308080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335 (or 329 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 20308080 is about 4506.4487126783. The cubic root of 20308080 is about 272.8284287387.

Adding to 20308080 its reverse (8080302), we get a palindrome (28388382).

The spelling of 20308080 in words is "twenty million, three hundred eight thousand, eighty".