20015460 has 144 divisors (see below), whose sum is σ = 66673152. Its totient is φ = 4838400.

The previous prime is 20015449. The next prime is 20015461. The reversal of 20015460 is 6451002.

It is a happy number.

20015460 is a `hidden beast` number, since 200 + 1 + 5 + 460 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20015461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 94755 + ... + 94965.

It is an arithmetic number, because the mean of its divisors is an integer number (463008).

Almost surely, 2^20015460 is an apocalyptic number.

20015460 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 20015460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33336576).

20015460 is an abundant number, since it is smaller than the sum of its proper divisors (46657692).

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

20015460 is a wasteful number, since it uses less digits than its factorization.

20015460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274 (or 269 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 20015460 is about 4473.8641016464. The cubic root of 20015460 is about 271.5116851396.

Adding to 20015460 its reverse (6451002), we get a palindrome (26466462).

The spelling of 20015460 in words is "twenty million, fifteen thousand, four hundred sixty".