20244021 has 16 divisors (see below), whose sum is σ = 31372800. Its totient is φ = 11371248.

The previous prime is 20243989. The next prime is 20244041. The reversal of 20244021 is 12044202.

It is not a de Polignac number, because 20244021 - 2⁵ = 20243989 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20244041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6931 + ... + 9408.

It is an arithmetic number, because the mean of its divisors is an integer number (1960800).

Almost surely, 2^20244021 is an apocalyptic number.

20244021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20244021 is a deficient number, since it is larger than the sum of its proper divisors (11128779).

20244021 is a wasteful number, since it uses less digits than its factorization.

20244021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16408.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 20244021 is about 4499.3356176218. The cubic root of 20244021 is about 272.5412602002.

Adding to 20244021 its reverse (12044202), we get a palindrome (32288223).

The spelling of 20244021 in words is "twenty million, two hundred forty-four thousand, twenty-one".