20404217072 has 20 divisors (see below), whose sum is σ = 39539556360. Its totient is φ = 10200460608.

The previous prime is 20404216997. The next prime is 20404217083. The reversal of 20404217072 is 27071240402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2423 + ... + 202025.

It is an arithmetic number, because the mean of its divisors is an integer number (1976977818).

Almost surely, 2^20404217072 is an apocalyptic number.

It is an amenable number.

20404217072 is a deficient number, since it is larger than the sum of its proper divisors (19135339288).

20404217072 is a wasteful number, since it uses less digits than its factorization.

20404217072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206000 (or 205994 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 29.

Adding to 20404217072 its reverse (27071240402), we get a palindrome (47475457474).

The spelling of 20404217072 in words is "twenty billion, four hundred four million, two hundred seventeen thousand, seventy-two".