20472251066 has 16 divisors (see below), whose sum is σ = 31534386048. Its totient is φ = 9962484000.

The previous prime is 20472251047. The next prime is 20472251123. The reversal of 20472251066 is 66015227402.

It is a super-2 number, since 2×20472251066² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 399410 + ... + 447741.

It is an arithmetic number, because the mean of its divisors is an integer number (1970899128).

Almost surely, 2^20472251066 is an apocalyptic number.

20472251066 is a deficient number, since it is larger than the sum of its proper divisors (11062134982).

20472251066 is a wasteful number, since it uses less digits than its factorization.

20472251066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 847477.

The product of its (nonzero) digits is 40320, while the sum is 35.

Adding to 20472251066 its reverse (66015227402), we get a palindrome (86487478468).

The spelling of 20472251066 in words is "twenty billion, four hundred seventy-two million, two hundred fifty-one thousand, sixty-six".