20238720 has 128 divisors (see below), whose sum is σ = 65802240. Its totient is φ = 5289984.

The previous prime is 20238719. The next prime is 20238731. The reversal of 20238720 is 2783202.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159297 + ... + 159423.

It is an arithmetic number, because the mean of its divisors is an integer number (514080).

Almost surely, 2^20238720 is an apocalyptic number.

20238720 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 20238720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32901120).

20238720 is an abundant number, since it is smaller than the sum of its proper divisors (45563520).

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

20238720 is a wasteful number, since it uses less digits than its factorization.

20238720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232 (or 220 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 20238720 is about 4498.7464920798. The cubic root of 20238720 is about 272.5174693511.

The spelling of 20238720 in words is "twenty million, two hundred thirty-eight thousand, seven hundred twenty".