20779916741 has 2 divisors, whose sum is σ = 20779916742. Its totient is φ = 20779916740.

The previous prime is 20779916669. The next prime is 20779916747. The reversal of 20779916741 is 14761997702.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11420128225 + 9359788516 = 106865^2 + 96746^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20779916741 is a prime.

It is a super-2 number, since 2×20779916741² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20779916747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10389958370 + 10389958371.

It is an arithmetic number, because the mean of its divisors is an integer number (10389958371).

Almost surely, 2^20779916741 is an apocalyptic number.

It is an amenable number.

20779916741 is a deficient number, since it is larger than the sum of its proper divisors (1).

20779916741 is an equidigital number, since it uses as much as digits as its factorization.

20779916741 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1333584, while the sum is 53.

The spelling of 20779916741 in words is "twenty billion, seven hundred seventy-nine million, nine hundred sixteen thousand, seven hundred forty-one".