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20310240 = 25351719131
BaseRepresentation
bin100110101111…
…0100011100000
31102012212102010
41031132203200
520144411430
62003152520
7334430346
oct115364340
942185363
1020310240
1110512425
126975740
1342916c2
1429a9996
151bb2cb0
hex135e8e0

20310240 has 192 divisors, whose sum is σ = 71850240. Its totient is φ = 4792320.

The previous prime is 20310217. The next prime is 20310247. The reversal of 20310240 is 4201302.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20310247) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 154975 + ... + 155105.

It is an arithmetic number, because the mean of its divisors is an integer number (374220).

Almost surely, 220310240 is an apocalyptic number.

20310240 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 20310240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35925120).

20310240 is an abundant number, since it is smaller than the sum of its proper divisors (51540000).

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

20310240 is a wasteful number, since it uses less digits than its factorization.

20310240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185 (or 177 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 20310240 is about 4506.6883628669. The cubic root of 20310240 is about 272.8381012190.

Adding to 20310240 its reverse (4201302), we get a palindrome (24511542).

The spelling of 20310240 in words is "twenty million, three hundred ten thousand, two hundred forty".