20514240 has 168 divisors, whose sum is σ = 74889360. Its totient is φ = 5136384.

The previous prime is 20514191. The next prime is 20514251. The reversal of 20514240 is 4241502.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48751 + ... + 49169.

It is an arithmetic number, because the mean of its divisors is an integer number (445770).

Almost surely, 2^20514240 is an apocalyptic number.

20514240 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 20514240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37444680).

20514240 is an abundant number, since it is smaller than the sum of its proper divisors (54375120).

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

20514240 is a wasteful number, since it uses less digits than its factorization.

20514240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459 (or 446 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 20514240 is about 4529.2648410090. The cubic root of 20514240 is about 273.7485394305.

Adding to 20514240 its reverse (4241502), we get a palindrome (24755742).

The spelling of 20514240 in words is "twenty million, five hundred fourteen thousand, two hundred forty".