20400333124 has 24 divisors (see below), whose sum is σ = 35896748888. Its totient is φ = 10144258560.

The previous prime is 20400333119. The next prime is 20400333169. The reversal of 20400333124 is 42133300402.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1444000000 + 18956333124 = 38000^2 + 137682^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20400333095 and 20400333104.

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, 582412 + ... + 616444.

Almost surely, 2^20400333124 is an apocalyptic number.

It is an amenable number.

20400333124 is a deficient number, since it is larger than the sum of its proper divisors (15496415764).

20400333124 is a wasteful number, since it uses less digits than its factorization.

20400333124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34855 (or 34853 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 20400333124 its reverse (42133300402), we get a palindrome (62533633526).

The spelling of 20400333124 in words is "twenty billion, four hundred million, three hundred thirty-three thousand, one hundred twenty-four".