20348557 has 8 divisors (see below), whose sum is σ = 20981016. Its totient is φ = 19720512.

The previous prime is 20348551. The next prime is 20348561. The reversal of 20348557 is 75584302.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 13645636 + 6702921 = 3694^2 + 2589^2 .

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 20348557 - 2⁷ = 20348429 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 (20348551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9903 + ... + 11779.

It is an arithmetic number, because the mean of its divisors is an integer number (2622627).

Almost surely, 2^20348557 is an apocalyptic number.

It is an amenable number.

20348557 is a deficient number, since it is larger than the sum of its proper divisors (632459).

20348557 is a wasteful number, since it uses less digits than its factorization.

20348557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2207.

The product of its (nonzero) digits is 33600, while the sum is 34.

The square root of 20348557 is about 4510.9374857118. The cubic root of 20348557 is about 273.0095708828.

The spelling of 20348557 in words is "twenty million, three hundred forty-eight thousand, five hundred fifty-seven".