20677556 has 12 divisors (see below), whose sum is σ = 36955968. Its totient is φ = 10118712.

The previous prime is 20677549. The next prime is 20677577. The reversal of 20677556 is 65577602.

It is a super-2 number, since 2×20677556² = 855122644266272, 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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54806 + ... + 55181.

It is an arithmetic number, because the mean of its divisors is an integer number (3079664).

Almost surely, 2^20677556 is an apocalyptic number.

It is an amenable number.

20677556 is a deficient number, since it is larger than the sum of its proper divisors (16278412).

20677556 is a wasteful number, since it uses less digits than its factorization.

20677556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110038 (or 110036 counting only the distinct ones).

The product of its (nonzero) digits is 88200, while the sum is 38.

The square root of 20677556 is about 4547.2580749282. The cubic root of 20677556 is about 274.4730670111.

The spelling of 20677556 in words is "twenty million, six hundred seventy-seven thousand, five hundred fifty-six".