20213444 has 12 divisors (see below), whose sum is σ = 35477904. Its totient is φ = 10076904.

The previous prime is 20213443. The next prime is 20213461. The reversal of 20213444 is 44431202.

It is a super-2 number, since 2×20213444² = 817166636682272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20213443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5894 + ... + 8669.

It is an arithmetic number, because the mean of its divisors is an integer number (2956492).

Almost surely, 2^20213444 is an apocalyptic number.

It is an amenable number.

20213444 is a deficient number, since it is larger than the sum of its proper divisors (15264460).

20213444 is a wasteful number, since it uses less digits than its factorization.

20213444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14914 (or 14912 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 20213444 is about 4495.9363874503. The cubic root of 20213444 is about 272.4039736843.

Adding to 20213444 its reverse (44431202), we get a palindrome (64644646).

The spelling of 20213444 in words is "twenty million, two hundred thirteen thousand, four hundred forty-four".