20027638 has 4 divisors (see below), whose sum is σ = 30041460. Its totient is φ = 10013818.

The previous prime is 20027633. The next prime is 20027659. The reversal of 20027638 is 83672002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83672002 = 2 ⋅41836001.

It is a super-2 number, since 2×20027638² = 802212567718088, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20027633) 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 as a sum of consecutive naturals, namely, 5006908 + ... + 5006911.

It is an arithmetic number, because the mean of its divisors is an integer number (7510365).

Almost surely, 2^20027638 is an apocalyptic number.

20027638 is a deficient number, since it is larger than the sum of its proper divisors (10013822).

20027638 is a wasteful number, since it uses less digits than its factorization.

20027638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10013821.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 20027638 is about 4475.2249105492. The cubic root of 20027638 is about 271.5667392318.

The spelling of 20027638 in words is "twenty million, twenty-seven thousand, six hundred thirty-eight".