20400323572 has 6 divisors (see below), whose sum is σ = 35700566258. Its totient is φ = 10200161784.

The previous prime is 20400323569. The next prime is 20400323599. The reversal of 20400323572 is 27532300402.

It can be written as a sum of positive squares in only one way, i.e., 15108343056 + 5291980516 = 122916^2 + 72746^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20400323572.

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, 2550040443 + ... + 2550040450.

Almost surely, 2^20400323572 is an apocalyptic number.

It is an amenable number.

20400323572 is a deficient number, since it is larger than the sum of its proper divisors (15300242686).

20400323572 is a wasteful number, since it uses less digits than its factorization.

20400323572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5100080897 (or 5100080895 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 28.

Adding to 20400323572 its reverse (27532300402), we get a palindrome (47932623974).

The spelling of 20400323572 in words is "twenty billion, four hundred million, three hundred twenty-three thousand, five hundred seventy-two".