20188426 has 4 divisors (see below), whose sum is σ = 30282642. Its totient is φ = 10094212.

The previous prime is 20188403. The next prime is 20188451. The reversal of 20188426 is 62488102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19351201 + 837225 = 4399^2 + 915^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5047105 + ... + 5047108.

Almost surely, 2^20188426 is an apocalyptic number.

20188426 is a deficient number, since it is larger than the sum of its proper divisors (10094216).

20188426 is a wasteful number, since it uses less digits than its factorization.

20188426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10094215.

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 20188426 is about 4493.1532357577. The cubic root of 20188426 is about 272.2915432943.

The spelling of 20188426 in words is "twenty million, one hundred eighty-eight thousand, four hundred twenty-six".