20770556 has 6 divisors (see below), whose sum is σ = 36348480. Its totient is φ = 10385276.

The previous prime is 20770523. The next prime is 20770567. The reversal of 20770556 is 65507702.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2596316 + ... + 2596323.

It is an arithmetic number, because the mean of its divisors is an integer number (6058080).

Almost surely, 2^20770556 is an apocalyptic number.

It is an amenable number.

20770556 is a deficient number, since it is larger than the sum of its proper divisors (15577924).

20770556 is a wasteful number, since it uses less digits than its factorization.

20770556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5192643 (or 5192641 counting only the distinct ones).

The product of its (nonzero) digits is 14700, while the sum is 32.

The square root of 20770556 is about 4557.4725451724. The cubic root of 20770556 is about 274.8839444175.

The spelling of 20770556 in words is "twenty million, seven hundred seventy thousand, five hundred fifty-six".