20623444 has 6 divisors (see below), whose sum is σ = 36091034. Its totient is φ = 10311720.

The previous prime is 20623439. The next prime is 20623453. The reversal of 20623444 is 44432602.

It can be written as a sum of positive squares in only one way, i.e., 19254544 + 1368900 = 4388^2 + 1170^2 .

It is a super-2 number, since 2×20623444² = 850652884842272, which contains 22 as substring.

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 as a sum of consecutive naturals, namely, 2577927 + ... + 2577934.

Almost surely, 2^20623444 is an apocalyptic number.

It is an amenable number.

20623444 is a deficient number, since it is larger than the sum of its proper divisors (15467590).

20623444 is a wasteful number, since it uses less digits than its factorization.

20623444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5155865 (or 5155863 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 25.

The square root of 20623444 is about 4541.3042179533. The cubic root of 20623444 is about 274.2334309965.

The spelling of 20623444 in words is "twenty million, six hundred twenty-three thousand, four hundred forty-four".