20461840

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{61}}^1\times {\mathrm{599}}^1$

素因数の和:680

約数の個数: 80

約数和(自身を含む): 55353600

約数和(自身を除く): 34891760

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 56, 61, 70, 80, 112, 122, 140, 244, 280, 305, 427, 488, 560, 599, 610, 854, 976, 1198, 1220, 1708, 2135, 2396, 2440, 2995, 3416, 4193, 4270, 4792, 4880, 5990, 6832, 8386, 8540, 9584, 11980, 16772, 17080, 20965, 23960, 33544, 34160, 36539, 41930, 47920, 67088, 73078, 83860, 146156, 167720, 182695, 255773, 292312, 335440, 365390, 511546, 584624, 730780, 1023092, 1278865, 1461560, 2046184, 2557730, 2923120, 4092368, 5115460, 10230920, 20461840]

約数ペア:

[(1, 20461840), (2, 10230920), (4, 5115460), (5, 4092368), (7, 2923120), (8, 2557730), (10, 2046184), (14, 1461560), (16, 1278865), (20, 1023092), (28, 730780), (35, 584624), (40, 511546), (56, 365390), (61, 335440), (70, 292312), (80, 255773), (112, 182695), (122, 167720), (140, 146156), (244, 83860), (280, 73078), (305, 67088), (427, 47920), (488, 41930), (560, 36539), (599, 34160), (610, 33544), (854, 23960), (976, 20965), (1198, 17080), (1220, 16772), (1708, 11980), (2135, 9584), (2396, 8540), (2440, 8386), (2995, 6832), (3416, 5990), (4193, 4880), (4270, 4792)]