20859619026457 has 16 divisors (see below), whose sum is σ = 23250250661760. Its totient is φ = 18598377053952.

The previous prime is 20859619026443. The next prime is 20859619026469. The reversal of 20859619026457 is 75462091695802.

It is not a de Polignac number, because 20859619026457 - 2¹⁹ = 20859618502169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20859119026457) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5059548 + ... + 8204770.

It is an arithmetic number, because the mean of its divisors is an integer number (1453140666360).

Almost surely, 2^{20859619026457} is an apocalyptic number.

It is an amenable number.

20859619026457 is a deficient number, since it is larger than the sum of its proper divisors (2390631635303).

20859619026457 is a wasteful number, since it uses less digits than its factorization.

20859619026457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3165792.

The product of its (nonzero) digits is 65318400, while the sum is 64.

The spelling of 20859619026457 in words is "twenty trillion, eight hundred fifty-nine billion, six hundred nineteen million, twenty-six thousand, four hundred fifty-seven".