20412440 has 16 divisors (see below), whose sum is σ = 45928080. Its totient is φ = 8164960.

The previous prime is 20412409. The next prime is 20412463. The reversal of 20412440 is 4421402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255116 + ... + 255195.

It is an arithmetic number, because the mean of its divisors is an integer number (2870505).

Almost surely, 2^20412440 is an apocalyptic number.

20412440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20412440 is an abundant number, since it is smaller than the sum of its proper divisors (25515640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20412440 is a wasteful number, since it uses less digits than its factorization.

20412440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510322 (or 510318 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 20412440 is about 4518.0128375205. The cubic root of 20412440 is about 273.2949711513.

Adding to 20412440 its reverse (4421402), we get a palindrome (24833842).

The spelling of 20412440 in words is "twenty million, four hundred twelve thousand, four hundred forty".