20436514065 has 48 divisors (see below), whose sum is σ = 39372765120. Its totient is φ = 9721645440.

The previous prime is 20436514051. The next prime is 20436514069. The reversal of 20436514065 is 56041563402.

20436514065 is a `hidden beast` number, since 20 + 436 + 5 + 140 + 65 = 666.

It is not a de Polignac number, because 20436514065 - 2⁹ = 20436513553 is a prime.

It is a super-2 number, since 2×20436514065² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20436514069) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 363255 + ... + 415724.

It is an arithmetic number, because the mean of its divisors is an integer number (820265940).

Almost surely, 2^20436514065 is an apocalyptic number.

It is an amenable number.

20436514065 is a deficient number, since it is larger than the sum of its proper divisors (18936251055).

20436514065 is a wasteful number, since it uses less digits than its factorization.

20436514065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 779054 (or 779051 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The spelling of 20436514065 in words is "twenty billion, four hundred thirty-six million, five hundred fourteen thousand, sixty-five".