20729369 has 2 divisors, whose sum is σ = 20729370. Its totient is φ = 20729368.

The previous prime is 20729351. The next prime is 20729377. The reversal of 20729369 is 96392702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12816400 + 7912969 = 3580^2 + 2813^2 .

It is a cyclic number.

It is not a de Polignac number, because 20729369 - 2¹² = 20725273 is a prime.

It is a super-2 number, since 2×20729369² = 859413478276322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20729329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10364684 + 10364685.

It is an arithmetic number, because the mean of its divisors is an integer number (10364685).

Almost surely, 2^20729369 is an apocalyptic number.

It is an amenable number.

20729369 is a deficient number, since it is larger than the sum of its proper divisors (1).

20729369 is an equidigital number, since it uses as much as digits as its factorization.

20729369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 38.

The square root of 20729369 is about 4552.9516799544. The cubic root of 20729369 is about 274.7021303679.

The spelling of 20729369 in words is "twenty million, seven hundred twenty-nine thousand, three hundred sixty-nine".