20505941768 has 32 divisors (see below), whose sum is σ = 41427240960. Its totient is φ = 9459478080.

The previous prime is 20505941749. The next prime is 20505941809. The reversal of 20505941768 is 86714950502.

It is a happy 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, 160121 + ... + 258167.

It is an arithmetic number, because the mean of its divisors is an integer number (1294601280).

Almost surely, 2^20505941768 is an apocalyptic number.

It is an amenable number.

20505941768 is an abundant number, since it is smaller than the sum of its proper divisors (20921299192).

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

20505941768 is a wasteful number, since it uses less digits than its factorization.

20505941768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100077 (or 100073 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 47.

The spelling of 20505941768 in words is "twenty billion, five hundred five million, nine hundred forty-one thousand, seven hundred sixty-eight".