20429273 has 2 divisors, whose sum is σ = 20429274. Its totient is φ = 20429272.

The previous prime is 20429251. The next prime is 20429309. The reversal of 20429273 is 37292402.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16540489 + 3888784 = 4067^2 + 1972^2 .

It is a cyclic number.

It is not a de Polignac number, because 20429273 - 2²² = 16234969 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20429203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10214636 + 10214637.

It is an arithmetic number, because the mean of its divisors is an integer number (10214637).

Almost surely, 2^20429273 is an apocalyptic number.

It is an amenable number.

20429273 is a deficient number, since it is larger than the sum of its proper divisors (1).

20429273 is an equidigital number, since it uses as much as digits as its factorization.

20429273 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 20429273 is about 4519.8753301391. The cubic root of 20429273 is about 273.3700742138.

It can be divided in two parts, 20429 and 273, that added together give a palindrome (20702).

The spelling of 20429273 in words is "twenty million, four hundred twenty-nine thousand, two hundred seventy-three".