20005216232465 has 8 divisors (see below), whose sum is σ = 24053985643968. Its totient is φ = 15972355542640.

The previous prime is 20005216232447. The next prime is 20005216232483. The reversal of 20005216232465 is 56423261250002.

It is an interprime number because it is at equal distance from previous prime (20005216232447) and next prime (20005216232483).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20005216232465 - 2⁶ = 20005216232401 is a prime.

It is a super-3 number, since 3×20005216232465³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

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, 3977177651 + ... + 3977182680.

It is an arithmetic number, because the mean of its divisors is an integer number (3006748205496).

Almost surely, 2^{20005216232465} is an apocalyptic number.

It is an amenable number.

20005216232465 is a deficient number, since it is larger than the sum of its proper divisors (4048769411503).

20005216232465 is an equidigital number, since it uses as much as digits as its factorization.

20005216232465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7954360839.

The product of its (nonzero) digits is 172800, while the sum is 38.

Adding to 20005216232465 its reverse (56423261250002), we get a palindrome (76428477482467).

The spelling of 20005216232465 in words is "twenty trillion, five billion, two hundred sixteen million, two hundred thirty-two thousand, four hundred sixty-five".