20890686419495 has 8 divisors (see below), whose sum is σ = 25222620168816. Its totient is φ = 16610018158656.

The previous prime is 20890686419461. The next prime is 20890686419521. The reversal of 20890686419495 is 59491468609802.

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

It is a cyclic number.

It is not a de Polignac number, because 20890686419495 - 2¹⁸ = 20890686157351 is a prime.

It is a Duffinian number.

It is a congruent 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, 12816371222 + ... + 12816372851.

It is an arithmetic number, because the mean of its divisors is an integer number (3152827521102).

Almost surely, 2^{20890686419495} is an apocalyptic number.

20890686419495 is a deficient number, since it is larger than the sum of its proper divisors (4331933749321).

20890686419495 is a wasteful number, since it uses less digits than its factorization.

20890686419495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25632744241.

The product of its (nonzero) digits is 268738560, while the sum is 71.

The spelling of 20890686419495 in words is "twenty trillion, eight hundred ninety billion, six hundred eighty-six million, four hundred nineteen thousand, four hundred ninety-five".