20470989 has 32 divisors (see below), whose sum is σ = 35518464. Its totient is φ = 10169280.

The previous prime is 20470973. The next prime is 20470993. The reversal of 20470989 is 98907402.

It is not a de Polignac number, because 20470989 - 2⁴ = 20470973 is a prime.

It is a super-2 number, since 2×20470989² = 838122781276242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20470939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3387 + ... + 7239.

It is an arithmetic number, because the mean of its divisors is an integer number (1109952).

Almost surely, 2^20470989 is an apocalyptic number.

It is an amenable number.

20470989 is a deficient number, since it is larger than the sum of its proper divisors (15047475).

20470989 is a wasteful number, since it uses less digits than its factorization.

20470989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3897.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 20470989 is about 4524.4877058071. The cubic root of 20470989 is about 273.5560190368.

The spelling of 20470989 in words is "twenty million, four hundred seventy thousand, nine hundred eighty-nine".