81807920

素因数分解:

$2^4\times 5^1\times {\mathrm{19}}^1\times {\mathrm{107}}^1\times {\mathrm{503}}^1$

素因数の和:642

約数の個数: 80

約数和(自身を含む): 202487040

約数和(自身を除く): 120679120

約数列:

[1, 2, 4, 5, 8, 10, 16, 19, 20, 38, 40, 76, 80, 95, 107, 152, 190, 214, 304, 380, 428, 503, 535, 760, 856, 1006, 1070, 1520, 1712, 2012, 2033, 2140, 2515, 4024, 4066, 4280, 5030, 8048, 8132, 8560, 9557, 10060, 10165, 16264, 19114, 20120, 20330, 32528, 38228, 40240, 40660, 47785, 53821, 76456, 81320, 95570, 107642, 152912, 162640, 191140, 215284, 269105, 382280, 430568, 538210, 764560, 861136, 1022599, 1076420, 2045198, 2152840, 4090396, 4305680, 5112995, 8180792, 10225990, 16361584, 20451980, 40903960, 81807920]

約数ペア:

[(1, 81807920), (2, 40903960), (4, 20451980), (5, 16361584), (8, 10225990), (10, 8180792), (16, 5112995), (19, 4305680), (20, 4090396), (38, 2152840), (40, 2045198), (76, 1076420), (80, 1022599), (95, 861136), (107, 764560), (152, 538210), (190, 430568), (214, 382280), (304, 269105), (380, 215284), (428, 191140), (503, 162640), (535, 152912), (760, 107642), (856, 95570), (1006, 81320), (1070, 76456), (1520, 53821), (1712, 47785), (2012, 40660), (2033, 40240), (2140, 38228), (2515, 32528), (4024, 20330), (4066, 20120), (4280, 19114), (5030, 16264), (8048, 10165), (8132, 10060), (8560, 9557)]