20657858777309 has 8 divisors (see below), whose sum is σ = 22255511104512. Its totient is φ = 19061433059760.

The previous prime is 20657858777287. The next prime is 20657858777333. The reversal of 20657858777309 is 90377785875602.

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

It is not a de Polignac number, because 20657858777309 - 2³² = 20653563810013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20657858777359) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 306617429 + ... + 306684794.

It is an arithmetic number, because the mean of its divisors is an integer number (2781938888064).

Almost surely, 2^{20657858777309} is an apocalyptic number.

It is an amenable number.

20657858777309 is a deficient number, since it is larger than the sum of its proper divisors (1597652327203).

20657858777309 is a wasteful number, since it uses less digits than its factorization.

20657858777309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613304827.

The product of its (nonzero) digits is 1244678400, while the sum is 74.

The spelling of 20657858777309 in words is "twenty trillion, six hundred fifty-seven billion, eight hundred fifty-eight million, seven hundred seventy-seven thousand, three hundred nine".