19980810

素因数分解:

$2^1\times 3^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{1721}}^1$

素因数の和:1780

約数の個数: 64

約数和(自身を含む): 54552960

約数和(自身を除く): 34572150

約数列:

[1, 2, 3, 5, 6, 9, 10, 15, 18, 27, 30, 43, 45, 54, 86, 90, 129, 135, 215, 258, 270, 387, 430, 645, 774, 1161, 1290, 1721, 1935, 2322, 3442, 3870, 5163, 5805, 8605, 10326, 11610, 15489, 17210, 25815, 30978, 46467, 51630, 74003, 77445, 92934, 148006, 154890, 222009, 232335, 370015, 444018, 464670, 666027, 740030, 1110045, 1332054, 1998081, 2220090, 3330135, 3996162, 6660270, 9990405, 19980810]

約数ペア:

[(1, 19980810), (2, 9990405), (3, 6660270), (5, 3996162), (6, 3330135), (9, 2220090), (10, 1998081), (15, 1332054), (18, 1110045), (27, 740030), (30, 666027), (43, 464670), (45, 444018), (54, 370015), (86, 232335), (90, 222009), (129, 154890), (135, 148006), (215, 92934), (258, 77445), (270, 74003), (387, 51630), (430, 46467), (645, 30978), (774, 25815), (1161, 17210), (1290, 15489), (1721, 11610), (1935, 10326), (2322, 8605), (3442, 5805), (3870, 5163)]