20307024 has 70 divisors (see below), whose sum is σ = 59024186. Its totient is φ = 6765120.

The previous prime is 20306987. The next prime is 20307037. The reversal of 20307024 is 42070302.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 10497600 + 9809424 = 3240^2 + 3132^2 .

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

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

It is a junction number, because it is equal to n+sod(n) for n = 20306988 and 20307006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 10794 + ... + 12534.

Almost surely, 2^20307024 is an apocalyptic number.

20307024 is a gapful number since it is divisible by the number (24) 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 20307024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29512093).

20307024 is an abundant number, since it is smaller than the sum of its proper divisors (38717162).

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

20307024 is an equidigital number, since it uses as much as digits as its factorization.

20307024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1767 (or 1746 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 18.

The square root of 20307024 is about 4506.3315457254. The cubic root of 20307024 is about 272.8236997209.

Adding to 20307024 its reverse (42070302), we get a palindrome (62377326).

The spelling of 20307024 in words is "twenty million, three hundred seven thousand, twenty-four".