20190556 has 6 divisors (see below), whose sum is σ = 35333480. Its totient is φ = 10095276.

The previous prime is 20190551. The next prime is 20190557. The reversal of 20190556 is 65509102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20190551) by changing a digit.

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, 2523816 + ... + 2523823.

Almost surely, 2^20190556 is an apocalyptic number.

It is an amenable number.

20190556 is a deficient number, since it is larger than the sum of its proper divisors (15142924).

20190556 is a wasteful number, since it uses less digits than its factorization.

20190556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5047643 (or 5047641 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 20190556 is about 4493.3902568106. The cubic root of 20190556 is about 272.3011190878.

Adding to 20190556 its reverse (65509102), we get a palindrome (85699658).

The spelling of 20190556 in words is "twenty million, one hundred ninety thousand, five hundred fifty-six".