20226638981397 has 32 divisors (see below), whose sum is σ = 27485372500992. Its totient is φ = 13228610288384.

The previous prime is 20226638981371. The next prime is 20226638981399. The reversal of 20226638981397 is 79318983662202.

It is not a de Polignac number, because 20226638981397 - 2¹² = 20226638977301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20226638981399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40377658 + ... + 40875524.

It is an arithmetic number, because the mean of its divisors is an integer number (858917890656).

Almost surely, 2^{20226638981397} is an apocalyptic number.

It is an amenable number.

20226638981397 is a deficient number, since it is larger than the sum of its proper divisors (7258733519595).

20226638981397 is a wasteful number, since it uses less digits than its factorization.

20226638981397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499097.

The product of its (nonzero) digits is 94058496, while the sum is 66.

The spelling of 20226638981397 in words is "twenty trillion, two hundred twenty-six billion, six hundred thirty-eight million, nine hundred eighty-one thousand, three hundred ninety-seven".