20218896 has 50 divisors (see below), whose sum is σ = 58523102. Its totient is φ = 6739200.

The previous prime is 20218879. The next prime is 20218897. The reversal of 20218896 is 69881202.

It can be written as a sum of positive squares in only one way, i.e., 19927296 + 291600 = 4464^2 + 540^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20218896.

It is not an unprimeable number, because it can be changed into a prime (20218897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 6505 + ... + 9096.

Almost surely, 2^20218896 is an apocalyptic number.

It is an amenable number.

20218896 is an abundant number, since it is smaller than the sum of its proper divisors (38304206).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20218896 is a wasteful number, since it uses less digits than its factorization.

20218896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15621 (or 15606 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 20218896 is about 4496.5426718758. The cubic root of 20218896 is about 272.4284625502.

The spelling of 20218896 in words is "twenty million, two hundred eighteen thousand, eight hundred ninety-six".