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20731332 = 2234340177
BaseRepresentation
bin100111100010…
…1010111000100
31110000021001010
41033011113010
520301400312
62020202220
7341133126
oct117052704
943007033
1020731332
111077a836
126b39370
1343ab27b
142a79216
151c4793c
hex13c55c4

20731332 has 24 divisors (see below), whose sum is σ = 49499296. Its totient is φ = 6749568.

The previous prime is 20731327. The next prime is 20731339. The reversal of 20731332 is 23313702.

It is a junction number, because it is equal to n+sod(n) for n = 20731299 and 20731308.

It is not an unprimeable number, because it can be changed into a prime (20731339) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19573 + ... + 20604.

Almost surely, 220731332 is an apocalyptic number.

It is an amenable number.

20731332 is an abundant number, since it is smaller than the sum of its proper divisors (28767964).

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

20731332 is a wasteful number, since it uses less digits than its factorization.

20731332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40227 (or 40225 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 21.

The square root of 20731332 is about 4553.1672492892. The cubic root of 20731332 is about 274.7108012101.

The spelling of 20731332 in words is "twenty million, seven hundred thirty-one thousand, three hundred thirty-two".

Divisors: 1 2 3 4 6 12 43 86 129 172 258 516 40177 80354 120531 160708 241062 482124 1727611 3455222 5182833 6910444 10365666 20731332