20643044 has 12 divisors (see below), whose sum is σ = 38026800. Its totient is φ = 9778248.

The previous prime is 20643043. The next prime is 20643061. The reversal of 20643044 is 44034602.

It is a happy number.

It is a super-2 number, since 2×20643044² = 852270531171872, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20643043) 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, 135734 + ... + 135885.

It is an arithmetic number, because the mean of its divisors is an integer number (3168900).

Almost surely, 2^20643044 is an apocalyptic number.

It is an amenable number.

20643044 is a deficient number, since it is larger than the sum of its proper divisors (17383756).

20643044 is a wasteful number, since it uses less digits than its factorization.

20643044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271642 (or 271640 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 20643044 is about 4543.4616758591. The cubic root of 20643044 is about 274.3202783307.

Adding to 20643044 its reverse (44034602), we get a palindrome (64677646).

The spelling of 20643044 in words is "twenty million, six hundred forty-three thousand, forty-four".