20429173 has 2 divisors, whose sum is σ = 20429174. Its totient is φ = 20429172.

The previous prime is 20429147. The next prime is 20429179. The reversal of 20429173 is 37192402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18173169 + 2256004 = 4263^2 + 1502^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20429173 is a prime.

It is a super-2 number, since 2×20429173² = 834702218927858, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20429179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10214586 + 10214587.

It is an arithmetic number, because the mean of its divisors is an integer number (10214587).

Almost surely, 2^20429173 is an apocalyptic number.

It is an amenable number.

20429173 is a deficient number, since it is larger than the sum of its proper divisors (1).

20429173 is an equidigital number, since it uses as much as digits as its factorization.

20429173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 20429173 is about 4519.8642678735. The cubic root of 20429173 is about 273.3696281700.

It can be divided in two parts, 20429 and 173, that added together give a palindrome (20602).

The spelling of 20429173 in words is "twenty million, four hundred twenty-nine thousand, one hundred seventy-three".