20156540441 has 2 divisors, whose sum is σ = 20156540442. Its totient is φ = 20156540440.

The previous prime is 20156540419. The next prime is 20156540479. The reversal of 20156540441 is 14404565102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15573792025 + 4582748416 = 124795^2 + 67696^2 .

It is a cyclic number.

It is not a de Polignac number, because 20156540441 - 2¹⁸ = 20156278297 is a prime.

It is a super-2 number, since 2×20156540441² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20156540398 and 20156540407.

It is not a weakly prime, because it can be changed into another prime (20156543441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10078270220 + 10078270221.

It is an arithmetic number, because the mean of its divisors is an integer number (10078270221).

Almost surely, 2^20156540441 is an apocalyptic number.

It is an amenable number.

20156540441 is a deficient number, since it is larger than the sum of its proper divisors (1).

20156540441 is an equidigital number, since it uses as much as digits as its factorization.

20156540441 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19200, while the sum is 32.

It can be divided in two parts, 2015 and 6540441, that added together give a palindrome (6542456).

The spelling of 20156540441 in words is "twenty billion, one hundred fifty-six million, five hundred forty thousand, four hundred forty-one".