20297436 has 24 divisors (see below), whose sum is σ = 48889344. Its totient is φ = 6547440.

The previous prime is 20297413. The next prime is 20297437. The reversal of 20297436 is 63479202.

It is a junction number, because it is equal to n+sod(n) for n = 20297397 and 20297406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20297437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26910 + ... + 27653.

It is an arithmetic number, because the mean of its divisors is an integer number (2037056).

Almost surely, 2^20297436 is an apocalyptic number.

It is an amenable number.

20297436 is an abundant number, since it is smaller than the sum of its proper divisors (28591908).

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

20297436 is a wasteful number, since it uses less digits than its factorization.

20297436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54601 (or 54599 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 33.

The square root of 20297436 is about 4505.2675836181. The cubic root of 20297436 is about 272.7807548851.

The spelling of 20297436 in words is "twenty million, two hundred ninety-seven thousand, four hundred thirty-six".