20400223112 has 8 divisors (see below), whose sum is σ = 38250418350. Its totient is φ = 10200111552.

The previous prime is 20400223111. The next prime is 20400223117. The reversal of 20400223112 is 21132200402.

It can be written as a sum of positive squares in only one way, i.e., 13608155716 + 6792067396 = 116654^2 + 82414^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (20400223111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1275013937 + ... + 1275013952.

Almost surely, 2^20400223112 is an apocalyptic number.

It is an amenable number.

20400223112 is a deficient number, since it is larger than the sum of its proper divisors (17850195238).

20400223112 is a wasteful number, since it uses less digits than its factorization.

20400223112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2550027895 (or 2550027891 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 20400223112 its reverse (21132200402), we get a palindrome (41532423514).

The spelling of 20400223112 in words is "twenty billion, four hundred million, two hundred twenty-three thousand, one hundred twelve".