21206480

素因数分解:

$2^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{31}}^1\times {\mathrm{503}}^1$

素因数の和:564

約数の個数: 80

約数和(自身を含む): 53996544

約数和(自身を除く): 32790064

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 31, 34, 40, 62, 68, 80, 85, 124, 136, 155, 170, 248, 272, 310, 340, 496, 503, 527, 620, 680, 1006, 1054, 1240, 1360, 2012, 2108, 2480, 2515, 2635, 4024, 4216, 5030, 5270, 8048, 8432, 8551, 10060, 10540, 15593, 17102, 20120, 21080, 31186, 34204, 40240, 42160, 42755, 62372, 68408, 77965, 85510, 124744, 136816, 155930, 171020, 249488, 265081, 311860, 342040, 530162, 623720, 684080, 1060324, 1247440, 1325405, 2120648, 2650810, 4241296, 5301620, 10603240, 21206480]

約数ペア:

[(1, 21206480), (2, 10603240), (4, 5301620), (5, 4241296), (8, 2650810), (10, 2120648), (16, 1325405), (17, 1247440), (20, 1060324), (31, 684080), (34, 623720), (40, 530162), (62, 342040), (68, 311860), (80, 265081), (85, 249488), (124, 171020), (136, 155930), (155, 136816), (170, 124744), (248, 85510), (272, 77965), (310, 68408), (340, 62372), (496, 42755), (503, 42160), (527, 40240), (620, 34204), (680, 31186), (1006, 21080), (1054, 20120), (1240, 17102), (1360, 15593), (2012, 10540), (2108, 10060), (2480, 8551), (2515, 8432), (2635, 8048), (4024, 5270), (4216, 5030)]