21980320

素因数分解:

$2^5\times 5^1\times {\mathrm{17}}^1\times {\mathrm{8081}}^1$

素因数の和:8113

約数の個数: 48

約数和(自身を含む): 54989928

約数和(自身を除く): 33009608

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 32, 34, 40, 68, 80, 85, 136, 160, 170, 272, 340, 544, 680, 1360, 2720, 8081, 16162, 32324, 40405, 64648, 80810, 129296, 137377, 161620, 258592, 274754, 323240, 549508, 646480, 686885, 1099016, 1292960, 1373770, 2198032, 2747540, 4396064, 5495080, 10990160, 21980320]

約数ペア:

[(1, 21980320), (2, 10990160), (4, 5495080), (5, 4396064), (8, 2747540), (10, 2198032), (16, 1373770), (17, 1292960), (20, 1099016), (32, 686885), (34, 646480), (40, 549508), (68, 323240), (80, 274754), (85, 258592), (136, 161620), (160, 137377), (170, 129296), (272, 80810), (340, 64648), (544, 40405), (680, 32324), (1360, 16162), (2720, 8081)]