20429668 has 18 divisors (see below), whose sum is σ = 41589366. Its totient is φ = 8755488.

The previous prime is 20429663. The next prime is 20429711. The reversal of 20429668 is 86692402.

It can be written as a sum of positive squares in only one way, i.e., 19079424 + 1350244 = 4368^2 + 1162^2 .

It is not an unprimeable number, because it can be changed into a prime (20429663) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 51921 + ... + 52312.

Almost surely, 2^20429668 is an apocalyptic number.

20429668 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20429668 is an abundant number, since it is smaller than the sum of its proper divisors (21159698).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20429668 is a wasteful number, since it uses less digits than its factorization.

20429668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104251 (or 104242 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 20429668 is about 4519.9190258234. The cubic root of 20429668 is about 273.3718360726.

The spelling of 20429668 in words is "twenty million, four hundred twenty-nine thousand, six hundred sixty-eight".