20551193 has 4 divisors (see below), whose sum is σ = 22132068. Its totient is φ = 18970320.

The previous prime is 20551183. The next prime is 20551207. The reversal of 20551193 is 39115502.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1646089 + 18905104 = 1283^2 + 4348^2 .

It is a cyclic number.

It is not a de Polignac number, because 20551193 - 2⁶ = 20551129 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20551183) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 790418 + ... + 790443.

It is an arithmetic number, because the mean of its divisors is an integer number (5533017).

Almost surely, 2^20551193 is an apocalyptic number.

It is an amenable number.

20551193 is a deficient number, since it is larger than the sum of its proper divisors (1580875).

20551193 is a wasteful number, since it uses less digits than its factorization.

20551193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580874.

The product of its (nonzero) digits is 1350, while the sum is 26.

The square root of 20551193 is about 4533.3423651871. The cubic root of 20551193 is about 273.9128116930.

Adding to 20551193 its reverse (39115502), we get a palindrome (59666695).

It can be divided in two parts, 20 and 551193, that multiplied together give a triangular number (11023860 = T₄₆₉₅).

The spelling of 20551193 in words is "twenty million, five hundred fifty-one thousand, one hundred ninety-three".