20305488 has 80 divisors (see below), whose sum is σ = 60440576. Its totient is φ = 5754240.

The previous prime is 20305487. The next prime is 20305507. The reversal of 20305488 is 88450302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20305487) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74793 + ... + 75063.

Almost surely, 2^20305488 is an apocalyptic number.

20305488 is a gapful number since it is divisible by the number (28) 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 20305488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30220288).

20305488 is an abundant number, since it is smaller than the sum of its proper divisors (40135088).

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

20305488 is a wasteful number, since it uses less digits than its factorization.

20305488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512 (or 506 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 20305488 is about 4506.1611156282. The cubic root of 20305488 is about 272.8168208569.

The spelling of 20305488 in words is "twenty million, three hundred five thousand, four hundred eighty-eight".