20420318 has 4 divisors (see below), whose sum is σ = 30630480. Its totient is φ = 10210158.

The previous prime is 20420311. The next prime is 20420329. The reversal of 20420318 is 81302402.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×20420318² = 833978774442248, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20420318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20420311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5105078 + ... + 5105081.

It is an arithmetic number, because the mean of its divisors is an integer number (7657620).

Almost surely, 2^20420318 is an apocalyptic number.

20420318 is a deficient number, since it is larger than the sum of its proper divisors (10210162).

20420318 is a wasteful number, since it uses less digits than its factorization.

20420318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10210161.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 20420318 is about 4518.8845968889. The cubic root of 20420318 is about 273.3301252185.

The spelling of 20420318 in words is "twenty million, four hundred twenty thousand, three hundred eighteen".