20103555 has 8 divisors (see below), whose sum is σ = 32165712. Its totient is φ = 10721888.

The previous prime is 20103553. The next prime is 20103599. The reversal of 20103555 is 55530102.

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 20103555 - 2¹ = 20103553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20103553) 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, 670104 + ... + 670133.

It is an arithmetic number, because the mean of its divisors is an integer number (4020714).

Almost surely, 2^20103555 is an apocalyptic number.

20103555 is a deficient number, since it is larger than the sum of its proper divisors (12062157).

20103555 is a wasteful number, since it uses less digits than its factorization.

20103555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1340245.

The product of its (nonzero) digits is 750, while the sum is 21.

The square root of 20103555 is about 4483.6988079040. The cubic root of 20103555 is about 271.9094412703.

Adding to 20103555 its reverse (55530102), we get a palindrome (75633657).

It can be divided in two parts, 2010 and 3555, that added together give a triangular number (5565 = T₁₀₅).

The spelling of 20103555 in words is "twenty million, one hundred three thousand, five hundred fifty-five".