20400020044 has 6 divisors (see below), whose sum is σ = 35700035084. Its totient is φ = 10200010020.

The previous prime is 20400020029. The next prime is 20400020057. The reversal of 20400020044 is 44002000402.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2550002502 + ... + 2550002509.

Almost surely, 2^20400020044 is an apocalyptic number.

It is an amenable number.

20400020044 is a deficient number, since it is larger than the sum of its proper divisors (15300015040).

20400020044 is a wasteful number, since it uses less digits than its factorization.

20400020044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5100005015 (or 5100005013 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

Adding to 20400020044 its reverse (44002000402), we get a palindrome (64402020446).

The spelling of 20400020044 in words is "twenty billion, four hundred million, twenty thousand, forty-four".