20309460 has 48 divisors (see below), whose sum is σ = 59342976. Its totient is φ = 5180032.

The previous prime is 20309453. The next prime is 20309489. The reversal of 20309460 is 6490302.

It is a self number, because there is not a number n which added to its sum of digits gives 20309460.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5979 + ... + 8738.

It is an arithmetic number, because the mean of its divisors is an integer number (1236312).

Almost surely, 2^20309460 is an apocalyptic number.

20309460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20309460 is an abundant number, since it is smaller than the sum of its proper divisors (39033516).

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

20309460 is a wasteful number, since it uses less digits than its factorization.

20309460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14752 (or 14750 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 20309460 is about 4506.6018239911. The cubic root of 20309460 is about 272.8346084580.

Adding to 20309460 its reverse (6490302), we get a palindrome (26799762).

The spelling of 20309460 in words is "twenty million, three hundred nine thousand, four hundred sixty".