81781840

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{37}}^1\times {\mathrm{3947}}^1$

素因数の和:4004

約数の個数: 80

約数和(自身を含む): 223235712

約数和(自身を除く): 141453872

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 37, 40, 56, 70, 74, 80, 112, 140, 148, 185, 259, 280, 296, 370, 518, 560, 592, 740, 1036, 1295, 1480, 2072, 2590, 2960, 3947, 4144, 5180, 7894, 10360, 15788, 19735, 20720, 27629, 31576, 39470, 55258, 63152, 78940, 110516, 138145, 146039, 157880, 221032, 276290, 292078, 315760, 442064, 552580, 584156, 730195, 1022273, 1105160, 1168312, 1460390, 2044546, 2210320, 2336624, 2920780, 4089092, 5111365, 5841560, 8178184, 10222730, 11683120, 16356368, 20445460, 40890920, 81781840]

約数ペア:

[(1, 81781840), (2, 40890920), (4, 20445460), (5, 16356368), (7, 11683120), (8, 10222730), (10, 8178184), (14, 5841560), (16, 5111365), (20, 4089092), (28, 2920780), (35, 2336624), (37, 2210320), (40, 2044546), (56, 1460390), (70, 1168312), (74, 1105160), (80, 1022273), (112, 730195), (140, 584156), (148, 552580), (185, 442064), (259, 315760), (280, 292078), (296, 276290), (370, 221032), (518, 157880), (560, 146039), (592, 138145), (740, 110516), (1036, 78940), (1295, 63152), (1480, 55258), (2072, 39470), (2590, 31576), (2960, 27629), (3947, 20720), (4144, 19735), (5180, 15788), (7894, 10360)]