20397522 has 16 divisors (see below), whose sum is σ = 40839840. Its totient is φ = 6791712.

The previous prime is 20397511. The next prime is 20397529. The reversal of 20397522 is 22579302.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20397522.

It is not an unprimeable number, because it can be changed into a prime (20397529) 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, 8398 + ... + 10550.

It is an arithmetic number, because the mean of its divisors is an integer number (2552490).

Almost surely, 2^20397522 is an apocalyptic number.

20397522 is an abundant number, since it is smaller than the sum of its proper divisors (20442318).

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

20397522 is a wasteful number, since it uses less digits than its factorization.

20397522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3737.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 20397522 is about 4516.3615887128. The cubic root of 20397522 is about 273.2283776429.

The spelling of 20397522 in words is "twenty million, three hundred ninety-seven thousand, five hundred twenty-two".