20748556 has 6 divisors (see below), whose sum is σ = 36309980. Its totient is φ = 10374276.

The previous prime is 20748547. The next prime is 20748557. The reversal of 20748556 is 65584702.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20748557) 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, 2593566 + ... + 2593573.

Almost surely, 2^20748556 is an apocalyptic number.

It is an amenable number.

20748556 is a deficient number, since it is larger than the sum of its proper divisors (15561424).

20748556 is a wasteful number, since it uses less digits than its factorization.

20748556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5187143 (or 5187141 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 37.

The square root of 20748556 is about 4555.0582872231. The cubic root of 20748556 is about 274.7868585367.

The spelling of 20748556 in words is "twenty million, seven hundred forty-eight thousand, five hundred fifty-six".