20349357 has 36 divisors (see below), whose sum is σ = 33598080. Its totient is φ = 10921344.

The previous prime is 20349353. The next prime is 20349383. The reversal of 20349357 is 75394302.

It is a happy number.

It is not a de Polignac number, because 20349357 - 2² = 20349353 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20349353) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 42244 + ... + 42722.

It is an arithmetic number, because the mean of its divisors is an integer number (933280).

Almost surely, 2^20349357 is an apocalyptic number.

It is an amenable number.

20349357 is a deficient number, since it is larger than the sum of its proper divisors (13248723).

20349357 is a wasteful number, since it uses less digits than its factorization.

20349357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530 (or 506 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 33.

The square root of 20349357 is about 4511.0261582039. The cubic root of 20349357 is about 273.0131486106.

It can be divided in two parts, 20349 and 357, that added together give a triangular number (20706 = T₂₀₃).

The spelling of 20349357 in words is "twenty million, three hundred forty-nine thousand, three hundred fifty-seven".