20552779 has 16 divisors (see below), whose sum is σ = 23671872. Its totient is φ = 17676288.

The previous prime is 20552773. The next prime is 20552801. The reversal of 20552779 is 97725502.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20552779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20552773) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 24562 + ... + 25384.

It is an arithmetic number, because the mean of its divisors is an integer number (1479492).

Almost surely, 2^20552779 is an apocalyptic number.

20552779 is a deficient number, since it is larger than the sum of its proper divisors (3119093).

20552779 is a wasteful number, since it uses less digits than its factorization.

20552779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 966.

The product of its (nonzero) digits is 44100, while the sum is 37.

The square root of 20552779 is about 4533.5172879344. The cubic root of 20552779 is about 273.9198577485.

The spelling of 20552779 in words is "twenty million, five hundred fifty-two thousand, seven hundred seventy-nine".