20868432761 has 4 divisors (see below), whose sum is σ = 22765563024. Its totient is φ = 18971302500.

The previous prime is 20868432733. The next prime is 20868432763. The reversal of 20868432761 is 16723486802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20868432761 - 2¹⁴ = 20868416377 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20868432763) 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, 948565115 + ... + 948565136.

It is an arithmetic number, because the mean of its divisors is an integer number (5691390756).

Almost surely, 2^20868432761 is an apocalyptic number.

It is an amenable number.

20868432761 is a deficient number, since it is larger than the sum of its proper divisors (1897130263).

20868432761 is a wasteful number, since it uses less digits than its factorization.

20868432761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1897130262.

The product of its (nonzero) digits is 774144, while the sum is 47.

The spelling of 20868432761 in words is "twenty billion, eight hundred sixty-eight million, four hundred thirty-two thousand, seven hundred sixty-one".