20125418 has 4 divisors (see below), whose sum is σ = 30188130. Its totient is φ = 10062708.

The previous prime is 20125411. The next prime is 20125439. The reversal of 20125418 is 81452102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81452102 = 2 ⋅40726051.

It can be written as a sum of positive squares in only one way, i.e., 19070689 + 1054729 = 4367^2 + 1027^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20125393 and 20125402.

It is not an unprimeable number, because it can be changed into a prime (20125411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5031353 + ... + 5031356.

Almost surely, 2^20125418 is an apocalyptic number.

20125418 is a deficient number, since it is larger than the sum of its proper divisors (10062712).

20125418 is a wasteful number, since it uses less digits than its factorization.

20125418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10062711.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 20125418 is about 4486.1361994483. The cubic root of 20125418 is about 272.0079744634.

The spelling of 20125418 in words is "twenty million, one hundred twenty-five thousand, four hundred eighteen".