20489170 has 24 divisors (see below), whose sum is σ = 39817764. Its totient is φ = 7546176.

The previous prime is 20489153. The next prime is 20489173. The reversal of 20489170 is 7198402.

It can be written as a sum of positive squares in 6 ways, for example, as 8357881 + 12131289 = 2891^2 + 3483^2 .

It is a super-3 number, since 3×20489170³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (20489173) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51412 + ... + 51808.

Almost surely, 2^20489170 is an apocalyptic number.

20489170 is a deficient number, since it is larger than the sum of its proper divisors (19328594).

20489170 is an equidigital number, since it uses as much as digits as its factorization.

20489170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814 (or 417 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 20489170 is about 4526.4964376436. The cubic root of 20489170 is about 273.6369799570.

The spelling of 20489170 in words is "twenty million, four hundred eighty-nine thousand, one hundred seventy".