20554397 has 8 divisors (see below), whose sum is σ = 20863416. Its totient is φ = 20247552.

The previous prime is 20554393. The next prime is 20554421. The reversal of 20554397 is 79345502.

It can be written as a sum of positive squares in 4 ways, for example, as 2669956 + 17884441 = 1634^2 + 4229^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20554397 - 2² = 20554393 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 (20554393) 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 7 ways as a sum of consecutive naturals, for example, 30023 + ... + 30699.

It is an arithmetic number, because the mean of its divisors is an integer number (2607927).

Almost surely, 2^20554397 is an apocalyptic number.

It is an amenable number.

20554397 is a deficient number, since it is larger than the sum of its proper divisors (309019).

20554397 is an equidigital number, since it uses as much as digits as its factorization.

20554397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1087.

The product of its (nonzero) digits is 37800, while the sum is 35.

The square root of 20554397 is about 4533.6957330637. The cubic root of 20554397 is about 273.9270455957.

Adding to 20554397 its reverse (79345502), we get a palindrome (99899899).

The spelling of 20554397 in words is "twenty million, five hundred fifty-four thousand, three hundred ninety-seven".