20430342515 has 64 divisors (see below), whose sum is σ = 28766707200. Its totient is φ = 13772851200.

The previous prime is 20430342511. The next prime is 20430342547. The reversal of 20430342515 is 51524303402.

It is a happy number.

It is not a de Polignac number, because 20430342515 - 2² = 20430342511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20430342511) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9453035 + ... + 9455195.

It is an arithmetic number, because the mean of its divisors is an integer number (449479800).

Almost surely, 2^20430342515 is an apocalyptic number.

20430342515 is a deficient number, since it is larger than the sum of its proper divisors (8336364685).

20430342515 is a wasteful number, since it uses less digits than its factorization.

20430342515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2388.

The product of its (nonzero) digits is 14400, while the sum is 29.

Adding to 20430342515 its reverse (51524303402), we get a palindrome (71954645917).

The spelling of 20430342515 in words is "twenty billion, four hundred thirty million, three hundred forty-two thousand, five hundred fifteen".