20881920346497 has 24 divisors (see below), whose sum is σ = 35403410218176. Its totient is φ = 11610025210656.

The previous prime is 20881920346489. The next prime is 20881920346517. The reversal of 20881920346497 is 79464302918802.

20881920346497 is a `hidden beast` number, since 2 + 0 + 8 + 81 + 9 + 2 + 0 + 3 + 464 + 97 = 666.

It is not a de Polignac number, because 20881920346497 - 2³ = 20881920346489 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (20881920346097) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4479174063 + ... + 4479178724.

It is an arithmetic number, because the mean of its divisors is an integer number (1475142092424).

Almost surely, 2^{20881920346497} is an apocalyptic number.

It is an amenable number.

20881920346497 is a deficient number, since it is larger than the sum of its proper divisors (14521489871679).

20881920346497 is a wasteful number, since it uses less digits than its factorization.

20881920346497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8958352837 (or 8958352834 counting only the distinct ones).

The product of its (nonzero) digits is 41803776, while the sum is 63.

The spelling of 20881920346497 in words is "twenty trillion, eight hundred eighty-one billion, nine hundred twenty million, three hundred forty-six thousand, four hundred ninety-seven".