20709460 has 12 divisors (see below), whose sum is σ = 43489908. Its totient is φ = 8283776.

The previous prime is 20709433. The next prime is 20709461. The reversal of 20709460 is 6490702.

It can be written as a sum of positive squares in 2 ways, for example, as 2202256 + 18507204 = 1484^2 + 4302^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20709461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 517717 + ... + 517756.

It is an arithmetic number, because the mean of its divisors is an integer number (3624159).

Almost surely, 2^20709460 is an apocalyptic number.

20709460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20709460 is an abundant number, since it is smaller than the sum of its proper divisors (22780448).

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

20709460 is a wasteful number, since it uses less digits than its factorization.

20709460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1035482 (or 1035480 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 20709460 is about 4550.7647708929. The cubic root of 20709460 is about 274.6141586193.

The spelling of 20709460 in words is "twenty million, seven hundred nine thousand, four hundred sixty".