20705043557064 has 64 divisors (see below), whose sum is σ = 52190204774400. Its totient is φ = 6844710104064.

The previous prime is 20705043557059. The next prime is 20705043557071. The reversal of 20705043557064 is 46075534050702.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6650394 + ... + 9254070.

It is an arithmetic number, because the mean of its divisors is an integer number (815471949600).

Almost surely, 2^{20705043557064} is an apocalyptic number.

20705043557064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20705043557064 is an abundant number, since it is smaller than the sum of its proper divisors (31485161217336).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20705043557064 is a wasteful number, since it uses less digits than its factorization.

20705043557064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2606422 (or 2606418 counting only the distinct ones).

The product of its (nonzero) digits is 3528000, while the sum is 48.

The spelling of 20705043557064 in words is "twenty trillion, seven hundred five billion, forty-three million, five hundred fifty-seven thousand, sixty-four".