20252357 has 4 divisors (see below), whose sum is σ = 20799756. Its totient is φ = 19704960.

The previous prime is 20252341. The next prime is 20252359. The reversal of 20252357 is 75325202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75325202 = 2 ⋅37662601.

It can be written as a sum of positive squares in 2 ways, for example, as 12859396 + 7392961 = 3586^2 + 2719^2 .

It is a cyclic number.

It is not a de Polignac number, because 20252357 - 2⁴ = 20252341 is a prime.

It is a super-3 number, since 3×20252357³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20252359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 273644 + ... + 273717.

It is an arithmetic number, because the mean of its divisors is an integer number (5199939).

Almost surely, 2^20252357 is an apocalyptic number.

It is an amenable number.

20252357 is a deficient number, since it is larger than the sum of its proper divisors (547399).

20252357 is an equidigital number, since it uses as much as digits as its factorization.

20252357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547398.

The product of its (nonzero) digits is 4200, while the sum is 26.

The square root of 20252357 is about 4500.2618812687. The cubic root of 20252357 is about 272.5786637077.

Adding to 20252357 its reverse (75325202), we get a palindrome (95577559).

The spelling of 20252357 in words is "twenty million, two hundred fifty-two thousand, three hundred fifty-seven".