20747144 has 24 divisors (see below), whose sum is σ = 42760830. Its totient is φ = 9430080.

The previous prime is 20747141. The next prime is 20747147. The reversal of 20747144 is 44174702.

It is an interprime number because it is at equal distance from previous prime (20747141) and next prime (20747147).

It can be written as a sum of positive squares in only one way, i.e., 20340100 + 407044 = 4510^2 + 638^2 .

It is not an unprimeable number, because it can be changed into a prime (20747141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9749 + ... + 11684.

Almost surely, 2^20747144 is an apocalyptic number.

It is an amenable number.

20747144 is an abundant number, since it is smaller than the sum of its proper divisors (22013686).

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

20747144 is a wasteful number, since it uses less digits than its factorization.

20747144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21461 (or 21446 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 29.

The square root of 20747144 is about 4554.9032920579. The cubic root of 20747144 is about 274.7806250452.

The spelling of 20747144 in words is "twenty million, seven hundred forty-seven thousand, one hundred forty-four".