20955747061 has 2 divisors, whose sum is σ = 20955747062. Its totient is φ = 20955747060.

The previous prime is 20955747019. The next prime is 20955747139. The reversal of 20955747061 is 16074755902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19566694161 + 1389052900 = 139881^2 + 37270^2 .

It is a cyclic number.

It is not a de Polignac number, because 20955747061 - 2¹⁵ = 20955714293 is a prime.

It is a super-2 number, since 2×20955747061² (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 (20955747011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10477873530 + 10477873531.

It is an arithmetic number, because the mean of its divisors is an integer number (10477873531).

Almost surely, 2^20955747061 is an apocalyptic number.

It is an amenable number.

20955747061 is a deficient number, since it is larger than the sum of its proper divisors (1).

20955747061 is an equidigital number, since it uses as much as digits as its factorization.

20955747061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 529200, while the sum is 46.

The spelling of 20955747061 in words is "twenty billion, nine hundred fifty-five million, seven hundred forty-seven thousand, sixty-one".