20001355 has 16 divisors (see below), whose sum is σ = 27030528. Its totient is φ = 14076000.

The previous prime is 20001341. The next prime is 20001361. The reversal of 20001355 is 55310002.

It is not a de Polignac number, because 20001355 - 2⁷ = 20001227 is a prime.

It is a Duffinian number.

20001355 is a modest number, since divided by 1355 gives 200 as remainder.

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, 4161 + ... + 7570.

It is an arithmetic number, because the mean of its divisors is an integer number (1689408).

Almost surely, 2^20001355 is an apocalyptic number.

20001355 is a deficient number, since it is larger than the sum of its proper divisors (7029173).

20001355 is a wasteful number, since it uses less digits than its factorization.

20001355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11778.

The product of its (nonzero) digits is 150, while the sum is 16.

The square root of 20001355 is about 4472.2874460392. The cubic root of 20001355 is about 271.4478915808.

Adding to 20001355 its reverse (55310002), we get a palindrome (75311357).

The spelling of 20001355 in words is "twenty million, one thousand, three hundred fifty-five".