20289270 has 32 divisors (see below), whose sum is σ = 50375520. Its totient is φ = 5223680.

The previous prime is 20289193. The next prime is 20289277. The reversal of 20289270 is 7298202.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20289277) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10791 + ... + 12530.

It is an arithmetic number, because the mean of its divisors is an integer number (1574235).

Almost surely, 2^20289270 is an apocalyptic number.

20289270 is an abundant number, since it is smaller than the sum of its proper divisors (30086250).

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

20289270 is a wasteful number, since it uses less digits than its factorization.

20289270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23360.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 20289270 is about 4504.3612199734. The cubic root of 20289270 is about 272.7441685492.

The spelling of 20289270 in words is "twenty million, two hundred eighty-nine thousand, two hundred seventy".