20029257 has 6 divisors (see below), whose sum is σ = 28931162. Its totient is φ = 13352832.

The previous prime is 20029253. The next prime is 20029259. The reversal of 20029257 is 75292002.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 12787776 + 7241481 = 3576^2 + 2691^2 .

It is not a de Polignac number, because 20029257 - 2² = 20029253 is a prime.

It is a super-2 number, since 2×20029257² = 802342271944098, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20029257.

It is not an unprimeable number, because it can be changed into a prime (20029253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1112728 + ... + 1112745.

Almost surely, 2^20029257 is an apocalyptic number.

It is an amenable number.

20029257 is a deficient number, since it is larger than the sum of its proper divisors (8901905).

20029257 is a wasteful number, since it uses less digits than its factorization.

20029257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2225479 (or 2225476 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 20029257 is about 4475.4057916573. The cubic root of 20029257 is about 271.5740566982.

The spelling of 20029257 in words is "twenty million, twenty-nine thousand, two hundred fifty-seven".