20233644 has 12 divisors (see below), whose sum is σ = 47211864. Its totient is φ = 6744544.

The previous prime is 20233643. The next prime is 20233649. The reversal of 20233644 is 44633202.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (20233643) 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, 843057 + ... + 843080.

It is an arithmetic number, because the mean of its divisors is an integer number (3934322).

Almost surely, 2^20233644 is an apocalyptic number.

It is an amenable number.

20233644 is an abundant number, since it is smaller than the sum of its proper divisors (26978220).

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

20233644 is a wasteful number, since it uses less digits than its factorization.

20233644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1686144 (or 1686142 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 24.

The square root of 20233644 is about 4498.1822995517. The cubic root of 20233644 is about 272.4946844066.

Adding to 20233644 its reverse (44633202), we get a palindrome (64866846).

The spelling of 20233644 in words is "twenty million, two hundred thirty-three thousand, six hundred forty-four".