20411681746 has 4 divisors (see below), whose sum is σ = 30617522622. Its totient is φ = 10205840872.

The previous prime is 20411681743. The next prime is 20411681749. The reversal of 20411681746 is 64718611402.

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

It is an interprime number because it is at equal distance from previous prime (20411681743) and next prime (20411681749).

It can be written as a sum of positive squares in only one way, i.e., 16560858721 + 3850823025 = 128689^2 + 62055^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 20411681699 and 20411681708.

It is not an unprimeable number, because it can be changed into a prime (20411681743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5102920435 + ... + 5102920438.

Almost surely, 2^20411681746 is an apocalyptic number.

20411681746 is a deficient number, since it is larger than the sum of its proper divisors (10205840876).

20411681746 is a wasteful number, since it uses less digits than its factorization.

20411681746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10205840875.

The product of its (nonzero) digits is 64512, while the sum is 40.

The spelling of 20411681746 in words is "twenty billion, four hundred eleven million, six hundred eighty-one thousand, seven hundred forty-six".