20401047878705 has 8 divisors (see below), whose sum is σ = 26364431104872. Its totient is φ = 15065389202688.

The previous prime is 20401047878699. The next prime is 20401047878713. The reversal of 20401047878705 is 50787874010402.

It can be written as a sum of positive squares in 4 ways, for example, as 170231333281 + 20230816545424 = 412591^2 + 4497868^2 .

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 20401047878705 - 2²⁸ = 20400779443249 is a prime.

It is a Duffinian 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, 156931137464 + ... + 156931137593.

It is an arithmetic number, because the mean of its divisors is an integer number (3295553888109).

Almost surely, 2^{20401047878705} is an apocalyptic number.

It is an amenable number.

20401047878705 is a deficient number, since it is larger than the sum of its proper divisors (5963383226167).

20401047878705 is a wasteful number, since it uses less digits than its factorization.

20401047878705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313862275075.

The product of its (nonzero) digits is 3512320, while the sum is 53.

The spelling of 20401047878705 in words is "twenty trillion, four hundred one billion, forty-seven million, eight hundred seventy-eight thousand, seven hundred five".