20223840 has 192 divisors, whose sum is σ = 78575616. Its totient is φ = 4257792.

The previous prime is 20223839. The next prime is 20223857. The reversal of 20223840 is 4832202.

It is a Harshad number since it is a multiple of its sum of digits (21).

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, 43449 + ... + 43911.

It is an arithmetic number, because the mean of its divisors is an integer number (409248).

Almost surely, 2^20223840 is an apocalyptic number.

20223840 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 20223840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39287808).

20223840 is an abundant number, since it is smaller than the sum of its proper divisors (58351776).

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

20223840 is a wasteful number, since it uses less digits than its factorization.

20223840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501 (or 493 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 20223840 is about 4497.0923939808. The cubic root of 20223840 is about 272.4506658157.

It can be divided in two parts, 202 and 23840, that added together give a palindrome (24042).

The spelling of 20223840 in words is "twenty million, two hundred twenty-three thousand, eight hundred forty".