20971384226 has 16 divisors (see below), whose sum is σ = 33894315000. Its totient is φ = 9674110848.

The previous prime is 20971384201. The next prime is 20971384243. The reversal of 20971384226 is 62248317902.

It is a Cunningham number, because it is equal to 144815²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 20890366225 + 81018001 = 144535^2 + 9001^2 .

It is a Curzon number.

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, 156251 + ... + 257598.

Almost surely, 2^20971384226 is an apocalyptic number.

20971384226 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20971384226 is a deficient number, since it is larger than the sum of its proper divisors (12922930774).

20971384226 is a wasteful number, since it uses less digits than its factorization.

20971384226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415813.

The product of its (nonzero) digits is 290304, while the sum is 44.

The spelling of 20971384226 in words is "twenty billion, nine hundred seventy-one million, three hundred eighty-four thousand, two hundred twenty-six".