20502240 has 144 divisors (see below), whose sum is σ = 71187984. Its totient is φ = 4956160.

The previous prime is 20502233. The next prime is 20502247. The reversal of 20502240 is 4220502.

It is an interprime number because it is at equal distance from previous prime (20502233) and next prime (20502247).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20502247) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57904 + ... + 58256.

It is an arithmetic number, because the mean of its divisors is an integer number (494361).

Almost surely, 2^20502240 is an apocalyptic number.

20502240 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 20502240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35593992).

20502240 is an abundant number, since it is smaller than the sum of its proper divisors (50685744).

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

20502240 is a wasteful number, since it uses less digits than its factorization.

20502240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393 (or 374 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 15.

The square root of 20502240 is about 4527.9399289302. The cubic root of 20502240 is about 273.6951517478.

Adding to 20502240 its reverse (4220502), we get a palindrome (24722742).

The spelling of 20502240 in words is "twenty million, five hundred two thousand, two hundred forty".