20401743617 has 2 divisors, whose sum is σ = 20401743618. Its totient is φ = 20401743616.

The previous prime is 20401743611. The next prime is 20401743641. The reversal of 20401743617 is 71634710402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10625280241 + 9776463376 = 103079^2 + 98876^2 .

It is a cyclic number.

It is not a de Polignac number, because 20401743617 - 2⁸ = 20401743361 is a prime.

It is a super-2 number, since 2×20401743617² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20401743611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200871808 + 10200871809.

It is an arithmetic number, because the mean of its divisors is an integer number (10200871809).

Almost surely, 2^20401743617 is an apocalyptic number.

It is an amenable number.

20401743617 is a deficient number, since it is larger than the sum of its proper divisors (1).

20401743617 is an equidigital number, since it uses as much as digits as its factorization.

20401743617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 35.

The spelling of 20401743617 in words is "twenty billion, four hundred one million, seven hundred forty-three thousand, six hundred seventeen".