20408460 has 96 divisors (see below), whose sum is σ = 60903360. Its totient is φ = 5096448.

The previous prime is 20408459. The next prime is 20408461. The reversal of 20408460 is 6480402.

It is an interprime number because it is at equal distance from previous prime (20408459) and next prime (20408461).

It is a self number, because there is not a number n which added to its sum of digits gives 20408460.

It is not an unprimeable number, because it can be changed into a prime (20408461) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 64222 + ... + 64538.

It is an arithmetic number, because the mean of its divisors is an integer number (634410).

Almost surely, 2^20408460 is an apocalyptic number.

20408460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20408460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30451680).

20408460 is an abundant number, since it is smaller than the sum of its proper divisors (40494900).

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

20408460 is a wasteful number, since it uses less digits than its factorization.

20408460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395 (or 393 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 20408460 is about 4517.5723569191. The cubic root of 20408460 is about 273.2772077239.

Adding to 20408460 its reverse (6480402), we get a palindrome (26888862).

The spelling of 20408460 in words is "twenty million, four hundred eight thousand, four hundred sixty".