20345355 has 24 divisors (see below), whose sum is σ = 35380800. Its totient is φ = 10815360.

The previous prime is 20345293. The next prime is 20345357. The reversal of 20345355 is 55354302.

20345355 is a `hidden beast` number, since 203 + 453 + 5 + 5 = 666.

It is not a de Polignac number, because 20345355 - 2¹⁵ = 20312587 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20345357) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18871 + ... + 19919.

It is an arithmetic number, because the mean of its divisors is an integer number (1474200).

Almost surely, 2^20345355 is an apocalyptic number.

20345355 is a deficient number, since it is larger than the sum of its proper divisors (15035445).

20345355 is a wasteful number, since it uses less digits than its factorization.

20345355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1491 (or 1488 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 27.

The square root of 20345355 is about 4510.5825566106. The cubic root of 20345355 is about 272.9952500884.

Adding to 20345355 its reverse (55354302), we get a palindrome (75699657).

The spelling of 20345355 in words is "twenty million, three hundred forty-five thousand, three hundred fifty-five".