20552709 has 16 divisors (see below), whose sum is σ = 28224000. Its totient is φ = 13297776.

The previous prime is 20552689. The next prime is 20552717. The reversal of 20552709 is 90725502.

It is a happy number.

It is not a de Polignac number, because 20552709 - 2¹² = 20548613 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20552759) by changing a digit.

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, 13992 + ... + 15390.

It is an arithmetic number, because the mean of its divisors is an integer number (1764000).

Almost surely, 2^20552709 is an apocalyptic number.

It is an amenable number.

20552709 is a deficient number, since it is larger than the sum of its proper divisors (7671291).

20552709 is a wasteful number, since it uses less digits than its factorization.

20552709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1544.

The product of its (nonzero) digits is 6300, while the sum is 30.

The square root of 20552709 is about 4533.5095676529. The cubic root of 20552709 is about 273.9195467701.

The spelling of 20552709 in words is "twenty million, five hundred fifty-two thousand, seven hundred nine".