20890686419494 has 8 divisors (see below), whose sum is σ = 31336178570568. Its totient is φ = 10445293562640.

The previous prime is 20890686419461. The next prime is 20890686419521. The reversal of 20890686419494 is 49491468609802.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24295327 + ... + 25140490.

It is an arithmetic number, because the mean of its divisors is an integer number (3917022321321).

Almost surely, 2^{20890686419494} is an apocalyptic number.

20890686419494 is a deficient number, since it is larger than the sum of its proper divisors (10445492151074).

20890686419494 is a wasteful number, since it uses less digits than its factorization.

20890686419494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49647110.

The product of its (nonzero) digits is 214990848, while the sum is 70.

The spelling of 20890686419494 in words is "twenty trillion, eight hundred ninety billion, six hundred eighty-six million, four hundred nineteen thousand, four hundred ninety-four".