20623872 has 80 divisors (see below), whose sum is σ = 56960640. Its totient is φ = 6623232.

The previous prime is 20623871. The next prime is 20623877. The reversal of 20623872 is 27832602.

It is not an unprimeable number, because it can be changed into a prime (20623871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44313 + ... + 44775.

It is an arithmetic number, because the mean of its divisors is an integer number (712008).

Almost surely, 2^20623872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20623872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28480320).

20623872 is an abundant number, since it is smaller than the sum of its proper divisors (36336768).

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

20623872 is an equidigital number, since it uses as much as digits as its factorization.

20623872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513 (or 497 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 20623872 is about 4541.3513407355. The cubic root of 20623872 is about 274.2353280462.

The spelling of 20623872 in words is "twenty million, six hundred twenty-three thousand, eight hundred seventy-two".