20461355 has 4 divisors (see below), whose sum is σ = 24553632. Its totient is φ = 16369080.

The previous prime is 20461349. The next prime is 20461373. The reversal of 20461355 is 55316402.

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

It is not a de Polignac number, because 20461355 - 2¹⁸ = 20199211 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2046131 + ... + 2046140.

It is an arithmetic number, because the mean of its divisors is an integer number (6138408).

Almost surely, 2^20461355 is an apocalyptic number.

20461355 is a deficient number, since it is larger than the sum of its proper divisors (4092277).

20461355 is an equidigital number, since it uses as much as digits as its factorization.

20461355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4092276.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 20461355 is about 4523.4229295966. The cubic root of 20461355 is about 273.5130989118.

Adding to 20461355 its reverse (55316402), we get a palindrome (75777757).

The spelling of 20461355 in words is "twenty million, four hundred sixty-one thousand, three hundred fifty-five".