19887940

素因数分解:

$2^2\times 5^1\times {\mathrm{89}}^1\times {\mathrm{11173}}^1$

素因数の和:11271

約数の個数: 24

約数和(自身を含む): 42237720

約数和(自身を除く): 22349780

約数列:

[1, 2, 4, 5, 10, 20, 89, 178, 356, 445, 890, 1780, 11173, 22346, 44692, 55865, 111730, 223460, 994397, 1988794, 3977588, 4971985, 9943970, 19887940]

約数ペア:

[(1, 19887940), (2, 9943970), (4, 4971985), (5, 3977588), (10, 1988794), (20, 994397), (89, 223460), (178, 111730), (356, 55865), (445, 44692), (890, 22346), (1780, 11173)]