20552805 has 96 divisors (see below), whose sum is σ = 45964800. Its totient is φ = 8636544.

The previous prime is 20552801. The next prime is 20552809. The reversal of 20552805 is 50825502.

It is an interprime number because it is at equal distance from previous prime (20552801) and next prime (20552809).

It is not a de Polignac number, because 20552805 - 2² = 20552801 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20552801) 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 95 ways as a sum of consecutive naturals, for example, 85876 + ... + 86114.

It is an arithmetic number, because the mean of its divisors is an integer number (478800).

Almost surely, 2^20552805 is an apocalyptic number.

It is an amenable number.

20552805 is an abundant number, since it is smaller than the sum of its proper divisors (25411995).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20552805 is a wasteful number, since it uses less digits than its factorization.

20552805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280 (or 267 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The square root of 20552805 is about 4533.5201554642. The cubic root of 20552805 is about 273.9199732546.

The spelling of 20552805 in words is "twenty million, five hundred fifty-two thousand, eight hundred five".