81978880

素因数分解:

$2^9\times 5^1\times {\mathrm{31}}^1\times {\mathrm{1033}}^1$

素因数の和:1087

約数の個数: 80

約数和(自身を含む): 203094144

約数和(自身を除く): 121115264

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 32, 40, 62, 64, 80, 124, 128, 155, 160, 248, 256, 310, 320, 496, 512, 620, 640, 992, 1033, 1240, 1280, 1984, 2066, 2480, 2560, 3968, 4132, 4960, 5165, 7936, 8264, 9920, 10330, 15872, 16528, 19840, 20660, 32023, 33056, 39680, 41320, 64046, 66112, 79360, 82640, 128092, 132224, 160115, 165280, 256184, 264448, 320230, 330560, 512368, 528896, 640460, 661120, 1024736, 1280920, 1322240, 2049472, 2561840, 2644480, 4098944, 5123680, 8197888, 10247360, 16395776, 20494720, 40989440, 81978880]

約数ペア:

[(1, 81978880), (2, 40989440), (4, 20494720), (5, 16395776), (8, 10247360), (10, 8197888), (16, 5123680), (20, 4098944), (31, 2644480), (32, 2561840), (40, 2049472), (62, 1322240), (64, 1280920), (80, 1024736), (124, 661120), (128, 640460), (155, 528896), (160, 512368), (248, 330560), (256, 320230), (310, 264448), (320, 256184), (496, 165280), (512, 160115), (620, 132224), (640, 128092), (992, 82640), (1033, 79360), (1240, 66112), (1280, 64046), (1984, 41320), (2066, 39680), (2480, 33056), (2560, 32023), (3968, 20660), (4132, 19840), (4960, 16528), (5165, 15872), (7936, 10330), (8264, 9920)]