29920257 has 36 divisors (see below), whose sum is σ = 46197840. Its totient is φ = 18650016.

The previous prime is 29920213. The next prime is 29920259. The reversal of 29920257 is 75202992.

It is not a de Polignac number, because 29920257 - 2⁷ = 29920129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (29920259) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 446538 + ... + 446604.

Almost surely, 2^29920257 is an apocalyptic number.

It is an amenable number.

29920257 is a deficient number, since it is larger than the sum of its proper divisors (16277583).

29920257 is a wasteful number, since it uses less digits than its factorization.

29920257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190 (or 158 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 29920257 is about 5469.9412245471. The cubic root of 29920257 is about 310.4476951422.

The spelling of 29920257 in words is "twenty-nine million, nine hundred twenty thousand, two hundred fifty-seven".