20946355 has 4 divisors (see below), whose sum is σ = 25135632. Its totient is φ = 16757080.

The previous prime is 20946347. The next prime is 20946361. The reversal of 20946355 is 55364902.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20946355 - 2³ = 20946347 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20946355.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2094631 + ... + 2094640.

It is an arithmetic number, because the mean of its divisors is an integer number (6283908).

Almost surely, 2^20946355 is an apocalyptic number.

20946355 is a deficient number, since it is larger than the sum of its proper divisors (4189277).

20946355 is an equidigital number, since it uses as much as digits as its factorization.

20946355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4189276.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 20946355 is about 4576.7188028106. The cubic root of 20946355 is about 275.6572927303.

It can be divided in two parts, 209 and 46355, that added together give a palindrome (46564).

The spelling of 20946355 in words is "twenty million, nine hundred forty-six thousand, three hundred fifty-five".