20889942291456 has 176 divisors, whose sum is σ = 65686195445760. Its totient is φ = 5776020725760.

The previous prime is 20889942291437. The next prime is 20889942291479. The reversal of 20889942291456 is 65419224998802.

It is a Smith number, since the sum of its digits (69) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15001836 + ... + 16335083.

Almost surely, 2^{20889942291456} is an apocalyptic number.

It is an amenable number.

20889942291456 is an abundant number, since it is smaller than the sum of its proper divisors (44796253154304).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20889942291456 is a wasteful number, since it uses less digits than its factorization.

20889942291456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31336980 (or 31336962 counting only the distinct ones).

The product of its (nonzero) digits is 179159040, while the sum is 69.

The spelling of 20889942291456 in words is "twenty trillion, eight hundred eighty-nine billion, nine hundred forty-two million, two hundred ninety-one thousand, four hundred fifty-six".