20400312133 has 8 divisors (see below), whose sum is σ = 20567472128. Its totient is φ = 20233254384.

The previous prime is 20400312091. The next prime is 20400312169. The reversal of 20400312133 is 33121300402.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20400312133 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20400312133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20400312833) 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, 404560 + ... + 452182.

It is an arithmetic number, because the mean of its divisors is an integer number (2570934016).

Almost surely, 2^20400312133 is an apocalyptic number.

It is an amenable number.

20400312133 is a deficient number, since it is larger than the sum of its proper divisors (167159995).

20400312133 is a wasteful number, since it uses less digits than its factorization.

20400312133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51123.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 20400312133 its reverse (33121300402), we get a palindrome (53521612535).

The spelling of 20400312133 in words is "twenty billion, four hundred million, three hundred twelve thousand, one hundred thirty-three".