20306236240 has 40 divisors (see below), whose sum is σ = 47286937728. Its totient is φ = 8109601920.

The previous prime is 20306236219. The next prime is 20306236241. The reversal of 20306236240 is 4263260302.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 20306236199 and 20306236208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20306236241) 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, 150652 + ... + 251611.

Almost surely, 2^20306236240 is an apocalyptic number.

20306236240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20306236240 is an abundant number, since it is smaller than the sum of its proper divisors (26980701488).

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

20306236240 is a wasteful number, since it uses less digits than its factorization.

20306236240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402907 (or 402901 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 28.

Adding to 20306236240 its reverse (4263260302), we get a palindrome (24569496542).

The spelling of 20306236240 in words is "twenty billion, three hundred six million, two hundred thirty-six thousand, two hundred forty".