20135546217 has 8 divisors (see below), whose sum is σ = 29830438880. Its totient is φ = 13423697460.

The previous prime is 20135546209. The next prime is 20135546239. The reversal of 20135546217 is 71264553102.

20135546217 is a `hidden beast` number, since 20 + 1 + 3 + 5 + 5 + 4 + 621 + 7 = 666.

It is not a de Polignac number, because 20135546217 - 2³ = 20135546209 is a prime.

It is a super-2 number, since 2×20135546217² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20135546257) 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, 372880459 + ... + 372880512.

It is an arithmetic number, because the mean of its divisors is an integer number (3728804860).

Almost surely, 2^20135546217 is an apocalyptic number.

20135546217 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20135546217 is a deficient number, since it is larger than the sum of its proper divisors (9694892663).

20135546217 is an equidigital number, since it uses as much as digits as its factorization.

20135546217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745760980 (or 745760974 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The spelling of 20135546217 in words is "twenty billion, one hundred thirty-five million, five hundred forty-six thousand, two hundred seventeen".