20933455 has 4 divisors (see below), whose sum is σ = 25120152. Its totient is φ = 16746760.

The previous prime is 20933449. The next prime is 20933461. The reversal of 20933455 is 55433902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55433902 = 2 ⋅27716951.

It is an interprime number because it is at equal distance from previous prime (20933449) and next prime (20933461).

It is not a de Polignac number, because 20933455 - 2¹³ = 20925263 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 2093341 + ... + 2093350.

It is an arithmetic number, because the mean of its divisors is an integer number (6280038).

Almost surely, 2^20933455 is an apocalyptic number.

20933455 is a deficient number, since it is larger than the sum of its proper divisors (4186697).

20933455 is an equidigital number, since it uses as much as digits as its factorization.

20933455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4186696.

The product of its (nonzero) digits is 16200, while the sum is 31.

The square root of 20933455 is about 4575.3092791635. The cubic root of 20933455 is about 275.6006924401.

The spelling of 20933455 in words is "twenty million, nine hundred thirty-three thousand, four hundred fifty-five".