20744660 has 12 divisors (see below), whose sum is σ = 43563828. Its totient is φ = 8297856.

The previous prime is 20744639. The next prime is 20744663. The reversal of 20744660 is 6644702.

It can be written as a sum of positive squares in 2 ways, for example, as 4519876 + 16224784 = 2126^2 + 4028^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20744663) 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, 518597 + ... + 518636.

It is an arithmetic number, because the mean of its divisors is an integer number (3630319).

Almost surely, 2^20744660 is an apocalyptic number.

20744660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20744660 is an abundant number, since it is smaller than the sum of its proper divisors (22819168).

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

20744660 is a wasteful number, since it uses less digits than its factorization.

20744660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1037242 (or 1037240 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 29.

The square root of 20744660 is about 4554.6306107082. The cubic root of 20744660 is about 274.7696583580.

The spelling of 20744660 in words is "twenty million, seven hundred forty-four thousand, six hundred sixty".