20400065396 has 24 divisors (see below), whose sum is σ = 36257651136. Its totient is φ = 10040944320.

The previous prime is 20400065383. The next prime is 20400065417. The reversal of 20400065396 is 69356000402.

It is a super-2 number, since 2×20400065396² (a number of 21 digits) contains 22 as substring.

It is a congruent 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, 379760 + ... + 430136.

It is an arithmetic number, because the mean of its divisors is an integer number (1510735464).

Almost surely, 2^20400065396 is an apocalyptic number.

It is an amenable number.

20400065396 is a deficient number, since it is larger than the sum of its proper divisors (15857585740).

20400065396 is a wasteful number, since it uses less digits than its factorization.

20400065396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51959 (or 51957 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 35.

Adding to 20400065396 its reverse (69356000402), we get a palindrome (89756065798).

It can be divided in two parts, 2040006 and 5396, that added together give a palindrome (2045402).

The spelling of 20400065396 in words is "twenty billion, four hundred million, sixty-five thousand, three hundred ninety-six".