20446665743 has 4 divisors (see below), whose sum is σ = 23367618000. Its totient is φ = 17525713488.

The previous prime is 20446665739. The next prime is 20446665781. The reversal of 20446665743 is 34756664402.

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

It is a cyclic number.

It is not a de Polignac number, because 20446665743 - 2² = 20446665739 is a prime.

It is a super-2 number, since 2×20446665743² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20446365743) 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, 1460476118 + ... + 1460476131.

It is an arithmetic number, because the mean of its divisors is an integer number (5841904500).

Almost surely, 2^20446665743 is an apocalyptic number.

20446665743 is a deficient number, since it is larger than the sum of its proper divisors (2920952257).

20446665743 is an equidigital number, since it uses as much as digits as its factorization.

20446665743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2920952256.

The product of its (nonzero) digits is 2903040, while the sum is 47.

The spelling of 20446665743 in words is "twenty billion, four hundred forty-six million, six hundred sixty-five thousand, seven hundred forty-three".