20218801 has 4 divisors (see below), whose sum is σ = 20364400. Its totient is φ = 20073204.

The previous prime is 20218799. The next prime is 20218819. The reversal of 20218801 is 10881202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20218801 - 2¹ = 20218799 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20228801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72591 + ... + 72868.

It is an arithmetic number, because the mean of its divisors is an integer number (5091100).

Almost surely, 2^20218801 is an apocalyptic number.

It is an amenable number.

20218801 is a deficient number, since it is larger than the sum of its proper divisors (145599).

20218801 is a wasteful number, since it uses less digits than its factorization.

20218801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145598.

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 20218801 is about 4496.5321081918. The cubic root of 20218801 is about 272.4280358743.

The spelling of 20218801 in words is "twenty million, two hundred eighteen thousand, eight hundred one".