20356672429 has 2 divisors, whose sum is σ = 20356672430. Its totient is φ = 20356672428.

The previous prime is 20356672421. The next prime is 20356672439. The reversal of 20356672429 is 92427665302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15907515625 + 4449156804 = 126125^2 + 66702^2 .

It is a cyclic number.

It is not a de Polignac number, because 20356672429 - 2³ = 20356672421 is a prime.

It is a super-2 number, since 2×20356672429² (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 (20356672421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10178336214 + 10178336215.

It is an arithmetic number, because the mean of its divisors is an integer number (10178336215).

Almost surely, 2^20356672429 is an apocalyptic number.

It is an amenable number.

20356672429 is a deficient number, since it is larger than the sum of its proper divisors (1).

20356672429 is an equidigital number, since it uses as much as digits as its factorization.

20356672429 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1088640, while the sum is 46.

The spelling of 20356672429 in words is "twenty billion, three hundred fifty-six million, six hundred seventy-two thousand, four hundred twenty-nine".