20487355 has 16 divisors (see below), whose sum is σ = 28416960. Its totient is φ = 13888512.

The previous prime is 20487343. The next prime is 20487359. The reversal of 20487355 is 55378402.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20487355 - 2¹¹ = 20485307 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20487355.

It is not an unprimeable number, because it can be changed into a prime (20487359) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174 + ... + 6403.

It is an arithmetic number, because the mean of its divisors is an integer number (1776060).

Almost surely, 2^20487355 is an apocalyptic number.

20487355 is a deficient number, since it is larger than the sum of its proper divisors (7929605).

20487355 is an equidigital number, since it uses as much as digits as its factorization.

20487355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6678.

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

The square root of 20487355 is about 4526.2959470189. The cubic root of 20487355 is about 273.6288998219.

The spelling of 20487355 in words is "twenty million, four hundred eighty-seven thousand, three hundred fifty-five".