20555513 has 8 divisors (see below), whose sum is σ = 22458816. Its totient is φ = 18658000.

The previous prime is 20555503. The next prime is 20555527. The reversal of 20555513 is 31555502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20555513 - 2¹² = 20551417 is a prime.

It is a super-2 number, since 2×20555513² = 845058229386338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20555503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9863 + ... + 11763.

It is an arithmetic number, because the mean of its divisors is an integer number (2807352).

Almost surely, 2^20555513 is an apocalyptic number.

It is an amenable number.

20555513 is a deficient number, since it is larger than the sum of its proper divisors (1903303).

20555513 is a wasteful number, since it uses less digits than its factorization.

20555513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2895.

The product of its (nonzero) digits is 3750, while the sum is 26.

The square root of 20555513 is about 4533.8188097894. The cubic root of 20555513 is about 273.9320031245.

The spelling of 20555513 in words is "twenty million, five hundred fifty-five thousand, five hundred thirteen".