20297550 has 96 divisors (see below), whose sum is σ = 61996032. Its totient is φ = 4279680.

The previous prime is 20297539. The next prime is 20297587. The reversal of 20297550 is 5579202.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12907 + ... + 14393.

It is an arithmetic number, because the mean of its divisors is an integer number (645792).

Almost surely, 2^20297550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20297550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30998016).

20297550 is an abundant number, since it is smaller than the sum of its proper divisors (41698482).

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

20297550 is a wasteful number, since it uses less digits than its factorization.

20297550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1522 (or 1517 counting only the distinct ones).

The product of its (nonzero) digits is 6300, while the sum is 30.

The square root of 20297550 is about 4505.2802354571. The cubic root of 20297550 is about 272.7812655728.

The spelling of 20297550 in words is "twenty million, two hundred ninety-seven thousand, five hundred fifty".