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20744369 = 171220257
BaseRepresentation
bin100111100100…
…0100010110001
31110000220220222
41033020202301
520302304434
62020342425
7341216132
oct117104261
943026828
1020744369
1110789608
126b44a15
1343b4199
142a7dc89
151c4b72e
hex13c88b1

20744369 has 4 divisors (see below), whose sum is σ = 21964644. Its totient is φ = 19524096.

The previous prime is 20744327. The next prime is 20744377. The reversal of 20744369 is 96344702.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14554225 + 6190144 = 3815^2 + 2488^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-20744369 is a prime.

It is a super-2 number, since 2×207443692 = 860657690416322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20744389) 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 3 ways as a sum of consecutive naturals, for example, 610112 + ... + 610145.

It is an arithmetic number, because the mean of its divisors is an integer number (5491161).

Almost surely, 220744369 is an apocalyptic number.

It is an amenable number.

20744369 is a deficient number, since it is larger than the sum of its proper divisors (1220275).

20744369 is a wasteful number, since it uses less digits than its factorization.

20744369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1220274.

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 20744369 is about 4554.5986650857. The cubic root of 20744369 is about 274.7683735560.

The spelling of 20744369 in words is "twenty million, seven hundred forty-four thousand, three hundred sixty-nine".

Divisors: 1 17 1220257 20744369