20280918805 has 8 divisors (see below), whose sum is σ = 27813831552. Its totient is φ = 13906915728.

The previous prime is 20280918799. The next prime is 20280918821. The reversal of 20280918805 is 50881908202.

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 20280918805 - 2⁵ = 20280918773 is a prime.

It is a super-2 number, since 2×20280918805² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent 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, 289727377 + ... + 289727446.

It is an arithmetic number, because the mean of its divisors is an integer number (3476728944).

Almost surely, 2^20280918805 is an apocalyptic number.

It is an amenable number.

20280918805 is a deficient number, since it is larger than the sum of its proper divisors (7532912747).

20280918805 is an equidigital number, since it uses as much as digits as its factorization.

20280918805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579454835.

The product of its (nonzero) digits is 92160, while the sum is 43.

The spelling of 20280918805 in words is "twenty billion, two hundred eighty million, nine hundred eighteen thousand, eight hundred five".