20514440 has 32 divisors (see below), whose sum is σ = 47234880. Its totient is φ = 8014272.

The previous prime is 20514421. The next prime is 20514443. The reversal of 20514440 is 4441502.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20514443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4244 + ... + 7683.

It is an arithmetic number, because the mean of its divisors is an integer number (1476090).

Almost surely, 2^20514440 is an apocalyptic number.

20514440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20514440 is an abundant number, since it is smaller than the sum of its proper divisors (26720440).

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

20514440 is a wasteful number, since it uses less digits than its factorization.

20514440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11981 (or 11977 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 20514440 is about 4529.2869195934. The cubic root of 20514440 is about 273.7494290488.

Adding to 20514440 its reverse (4441502), we get a palindrome (24955942).

The spelling of 20514440 in words is "twenty million, five hundred fourteen thousand, four hundred forty".