20553806 has 32 divisors (see below), whose sum is σ = 39180288. Its totient is φ = 7866720.

The previous prime is 20553787. The next prime is 20553823. The reversal of 20553806 is 60835502.

It is a congruent number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 3821 + ... + 7463.

It is an arithmetic number, because the mean of its divisors is an integer number (1224384).

Almost surely, 2^20553806 is an apocalyptic number.

20553806 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20553806 is a deficient number, since it is larger than the sum of its proper divisors (18626482).

20553806 is a wasteful number, since it uses less digits than its factorization.

20553806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3696.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 20553806 is about 4533.6305539821. The cubic root of 20553806 is about 273.9244201650.

The spelling of 20553806 in words is "twenty million, five hundred fifty-three thousand, eight hundred six".