20115418 has 4 divisors (see below), whose sum is σ = 30173130. Its totient is φ = 10057708.

The previous prime is 20115413. The next prime is 20115439. The reversal of 20115418 is 81451102.

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

It can be written as a sum of positive squares in only one way, i.e., 12089529 + 8025889 = 3477^2 + 2833^2 .

It is not an unprimeable number, because it can be changed into a prime (20115413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5028853 + ... + 5028856.

Almost surely, 2^20115418 is an apocalyptic number.

20115418 is a deficient number, since it is larger than the sum of its proper divisors (10057712).

20115418 is a wasteful number, since it uses less digits than its factorization.

20115418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10057711.

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 20115418 is about 4485.0215161134. The cubic root of 20115418 is about 271.9629148546.

The spelling of 20115418 in words is "twenty million, one hundred fifteen thousand, four hundred eighteen".