20781416324707 has 4 divisors (see below), whose sum is σ = 20787068059776. Its totient is φ = 20775764589640.

The previous prime is 20781416324671. The next prime is 20781416324717. The reversal of 20781416324707 is 70742361418702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20781416324707 is a prime.

It is a super-3 number, since 3×20781416324707³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20781416324717) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2825862019 + ... + 2825869372.

It is an arithmetic number, because the mean of its divisors is an integer number (5196767014944).

Almost surely, 2^{20781416324707} is an apocalyptic number.

20781416324707 is a deficient number, since it is larger than the sum of its proper divisors (5651735069).

20781416324707 is an equidigital number, since it uses as much as digits as its factorization.

20781416324707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5651735068.

The product of its (nonzero) digits is 3161088, while the sum is 52.

The spelling of 20781416324707 in words is "twenty trillion, seven hundred eighty-one billion, four hundred sixteen million, three hundred twenty-four thousand, seven hundred seven".