21191820

素因数分解:

$2^2\times 3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{101}}^1\times {\mathrm{269}}^1$

素因数の和:395

約数の個数: 96

約数和(自身を含む): 64774080

約数和(自身を除く): 43582260

約数列:

[1, 2, 3, 4, 5, 6, 10, 12, 13, 15, 20, 26, 30, 39, 52, 60, 65, 78, 101, 130, 156, 195, 202, 260, 269, 303, 390, 404, 505, 538, 606, 780, 807, 1010, 1076, 1212, 1313, 1345, 1515, 1614, 2020, 2626, 2690, 3030, 3228, 3497, 3939, 4035, 5252, 5380, 6060, 6565, 6994, 7878, 8070, 10491, 13130, 13988, 15756, 16140, 17485, 19695, 20982, 26260, 27169, 34970, 39390, 41964, 52455, 54338, 69940, 78780, 81507, 104910, 108676, 135845, 163014, 209820, 271690, 326028, 353197, 407535, 543380, 706394, 815070, 1059591, 1412788, 1630140, 1765985, 2119182, 3531970, 4238364, 5297955, 7063940, 10595910, 21191820]

約数ペア:

[(1, 21191820), (2, 10595910), (3, 7063940), (4, 5297955), (5, 4238364), (6, 3531970), (10, 2119182), (12, 1765985), (13, 1630140), (15, 1412788), (20, 1059591), (26, 815070), (30, 706394), (39, 543380), (52, 407535), (60, 353197), (65, 326028), (78, 271690), (101, 209820), (130, 163014), (156, 135845), (195, 108676), (202, 104910), (260, 81507), (269, 78780), (303, 69940), (390, 54338), (404, 52455), (505, 41964), (538, 39390), (606, 34970), (780, 27169), (807, 26260), (1010, 20982), (1076, 19695), (1212, 17485), (1313, 16140), (1345, 15756), (1515, 13988), (1614, 13130), (2020, 10491), (2626, 8070), (2690, 7878), (3030, 6994), (3228, 6565), (3497, 6060), (3939, 5380), (4035, 5252)]