20612429 has 2 divisors, whose sum is σ = 20612430. Its totient is φ = 20612428.

The previous prime is 20612419. The next prime is 20612447. The reversal of 20612429 is 92421602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18576100 + 2036329 = 4310^2 + 1427^2 .

It is a cyclic number.

It is not a de Polignac number, because 20612429 - 2⁴ = 20612413 is a prime.

It is equal to p_1306943 and since 20612429 and 1306943 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 20612398 and 20612407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20612419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10306214 + 10306215.

It is an arithmetic number, because the mean of its divisors is an integer number (10306215).

Almost surely, 2^20612429 is an apocalyptic number.

It is an amenable number.

20612429 is a deficient number, since it is larger than the sum of its proper divisors (1).

20612429 is an equidigital number, since it uses as much as digits as its factorization.

20612429 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 20612429 is about 4540.0912986415. The cubic root of 20612429 is about 274.1845995277.

The spelling of 20612429 in words is "twenty million, six hundred twelve thousand, four hundred twenty-nine".