20418885 has 20 divisors (see below), whose sum is σ = 36603468. Its totient is φ = 10889856.

The previous prime is 20418883. The next prime is 20418889. The reversal of 20418885 is 58881402.

It can be written as a sum of positive squares in 2 ways, for example, as 7001316 + 13417569 = 2646^2 + 3663^2 .

It is not a de Polignac number, because 20418885 - 2¹ = 20418883 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20418883) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 24804 + ... + 25613.

Almost surely, 2^20418885 is an apocalyptic number.

It is an amenable number.

20418885 is a deficient number, since it is larger than the sum of its proper divisors (16184583).

20418885 is an equidigital number, since it uses as much as digits as its factorization.

20418885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50434 (or 50425 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The square root of 20418885 is about 4518.7260372809. The cubic root of 20418885 is about 273.3237314031.

The spelling of 20418885 in words is "twenty million, four hundred eighteen thousand, eight hundred eighty-five".