20430235240 has 32 divisors (see below), whose sum is σ = 47210411880. Its totient is φ = 7951226112.

The previous prime is 20430235187. The next prime is 20430235253. The reversal of 20430235240 is 4253203402.

It can be written as a sum of positive squares in 4 ways, for example, as 16303714596 + 4126520644 = 127686^2 + 64238^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6900627 + ... + 6903586.

Almost surely, 2^20430235240 is an apocalyptic number.

20430235240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20430235240 is an abundant number, since it is smaller than the sum of its proper divisors (26780176640).

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

20430235240 is a wasteful number, since it uses less digits than its factorization.

20430235240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13804261 (or 13804257 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 25.

Adding to 20430235240 its reverse (4253203402), we get a palindrome (24683438642).

The spelling of 20430235240 in words is "twenty billion, four hundred thirty million, two hundred thirty-five thousand, two hundred forty".