20542357 has 8 divisors (see below), whose sum is σ = 22662720. Its totient is φ = 18464160.

The previous prime is 20542349. The next prime is 20542373. The reversal of 20542357 is 75324502.

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

It is not a de Polignac number, because 20542357 - 2³ = 20542349 is a prime.

It is a super-2 number, since 2×20542357² = 843976862230898, which contains 22 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 (20542387) 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, 9513 + ... + 11470.

It is an arithmetic number, because the mean of its divisors is an integer number (2832840).

Almost surely, 2^20542357 is an apocalyptic number.

It is an amenable number.

20542357 is a deficient number, since it is larger than the sum of its proper divisors (2120363).

20542357 is a wasteful number, since it uses less digits than its factorization.

20542357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21083.

The product of its (nonzero) digits is 8400, while the sum is 28.

The square root of 20542357 is about 4532.3677035298. The cubic root of 20542357 is about 273.8735497297.

Adding to 20542357 its reverse (75324502), we get a palindrome (95866859).

The spelling of 20542357 in words is "twenty million, five hundred forty-two thousand, three hundred fifty-seven".