20297535 has 24 divisors (see below), whose sum is σ = 33655440. Its totient is φ = 10445568.

The previous prime is 20297531. The next prime is 20297539. The reversal of 20297535 is 53579202.

It is an interprime number because it is at equal distance from previous prime (20297531) and next prime (20297539).

It is not a de Polignac number, because 20297535 - 2² = 20297531 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20297496 and 20297505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20297531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11811 + ... + 13419.

It is an arithmetic number, because the mean of its divisors is an integer number (1402310).

Almost surely, 2^20297535 is an apocalyptic number.

20297535 is a deficient number, since it is larger than the sum of its proper divisors (13357905).

20297535 is a wasteful number, since it uses less digits than its factorization.

20297535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1675 (or 1646 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 33.

The square root of 20297535 is about 4505.2785707434. The cubic root of 20297535 is about 272.7811983771.

The spelling of 20297535 in words is "twenty million, two hundred ninety-seven thousand, five hundred thirty-five".