20478124 has 24 divisors (see below), whose sum is σ = 37920960. Its totient is φ = 9649296.

The previous prime is 20478121. The next prime is 20478173. The reversal of 20478124 is 42187402.

It is a junction number, because it is equal to n+sod(n) for n = 20478092 and 20478101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20478121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16659 + ... + 17845.

It is an arithmetic number, because the mean of its divisors is an integer number (1580040).

Almost surely, 2^20478124 is an apocalyptic number.

It is an amenable number.

20478124 is a deficient number, since it is larger than the sum of its proper divisors (17442836).

20478124 is a wasteful number, since it uses less digits than its factorization.

20478124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1437 (or 1435 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 20478124 is about 4525.2761241719. The cubic root of 20478124 is about 273.5877972682.

It can be divided in two parts, 20478 and 124, that added together give a palindrome (20602).

The spelling of 20478124 in words is "twenty million, four hundred seventy-eight thousand, one hundred twenty-four".