20601156439 has 2 divisors, whose sum is σ = 20601156440. Its totient is φ = 20601156438.

The previous prime is 20601156409. The next prime is 20601156487. The reversal of 20601156439 is 93465110602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20601156439 - 2¹¹ = 20601154391 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20601156398 and 20601156407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20601156409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10300578219 + 10300578220.

It is an arithmetic number, because the mean of its divisors is an integer number (10300578220).

Almost surely, 2^20601156439 is an apocalyptic number.

20601156439 is a deficient number, since it is larger than the sum of its proper divisors (1).

20601156439 is an equidigital number, since it uses as much as digits as its factorization.

20601156439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 37.

It can be divided in two parts, 206011 and 56439, that added together give a triangular number (262450 = T₇₂₄).

The spelling of 20601156439 in words is "twenty billion, six hundred one million, one hundred fifty-six thousand, four hundred thirty-nine".