20397270 has 16 divisors (see below), whose sum is σ = 48953520. Its totient is φ = 5439264.

The previous prime is 20397269. The next prime is 20397313. The reversal of 20397270 is 7279302.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 679909 = 20397270 / (2 + 0 + 3 + 9 + 7 + 2 + 7 + 0).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 339925 + ... + 339984.

It is an arithmetic number, because the mean of its divisors is an integer number (3059595).

Almost surely, 2^20397270 is an apocalyptic number.

20397270 is an abundant number, since it is smaller than the sum of its proper divisors (28556250).

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

20397270 is a wasteful number, since it uses less digits than its factorization.

20397270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679919.

The product of its (nonzero) digits is 5292, while the sum is 30.

The square root of 20397270 is about 4516.3336900632. Note that the first 3 decimals coincide. The cubic root of 20397270 is about 273.2272524435.

The spelling of 20397270 in words is "twenty million, three hundred ninety-seven thousand, two hundred seventy".