20122549 has 4 divisors (see below), whose sum is σ = 20816460. Its totient is φ = 19428640.

The previous prime is 20122541. The next prime is 20122559. The reversal of 20122549 is 94522102.

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 9721924 + 10400625 = 3118^2 + 3225^2 .

It is a cyclic number.

It is not a de Polignac number, because 20122549 - 2³ = 20122541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20122541) by changing a digit.

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, 346912 + ... + 346969.

It is an arithmetic number, because the mean of its divisors is an integer number (5204115).

Almost surely, 2^20122549 is an apocalyptic number.

20122549 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

20122549 is a deficient number, since it is larger than the sum of its proper divisors (693911).

20122549 is an equidigital number, since it uses as much as digits as its factorization.

20122549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693910.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 20122549 is about 4485.8164251338. The cubic root of 20122549 is about 271.9950483888.

The spelling of 20122549 in words is "twenty million, one hundred twenty-two thousand, five hundred forty-nine".