20400040022 has 4 divisors (see below), whose sum is σ = 30600060036. Its totient is φ = 10200020010.

The previous prime is 20400040009. The next prime is 20400040051. The reversal of 20400040022 is 22004000402.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 20400039979 and 20400040006.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5100010004 + ... + 5100010007.

It is an arithmetic number, because the mean of its divisors is an integer number (7650015009).

Almost surely, 2^20400040022 is an apocalyptic number.

20400040022 is a deficient number, since it is larger than the sum of its proper divisors (10200020014).

20400040022 is a wasteful number, since it uses less digits than its factorization.

20400040022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10200020013.

The product of its (nonzero) digits is 128, while the sum is 14.

Adding to 20400040022 its reverse (22004000402), we get a palindrome (42404040424).

The spelling of 20400040022 in words is "twenty billion, four hundred million, forty thousand, twenty-two".