20478920

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{61}}^1\times {\mathrm{109}}^1$

素因数の和:199

約数の個数: 128

約数和(自身を含む): 58924800

約数和(自身を除く): 38445880

約数列:

[1, 2, 4, 5, 7, 8, 10, 11, 14, 20, 22, 28, 35, 40, 44, 55, 56, 61, 70, 77, 88, 109, 110, 122, 140, 154, 218, 220, 244, 280, 305, 308, 385, 427, 436, 440, 488, 545, 610, 616, 671, 763, 770, 854, 872, 1090, 1199, 1220, 1342, 1526, 1540, 1708, 2135, 2180, 2398, 2440, 2684, 3052, 3080, 3355, 3416, 3815, 4270, 4360, 4697, 4796, 5368, 5995, 6104, 6649, 6710, 7630, 8393, 8540, 9394, 9592, 11990, 13298, 13420, 15260, 16786, 17080, 18788, 23485, 23980, 26596, 26840, 30520, 33245, 33572, 37576, 41965, 46543, 46970, 47960, 53192, 66490, 67144, 73139, 83930, 93086, 93940, 132980, 146278, 167860, 186172, 187880, 232715, 265960, 292556, 335720, 365695, 372344, 465430, 511973, 585112, 731390, 930860, 1023946, 1462780, 1861720, 2047892, 2559865, 2925560, 4095784, 5119730, 10239460, 20478920]

約数ペア:

[(1, 20478920), (2, 10239460), (4, 5119730), (5, 4095784), (7, 2925560), (8, 2559865), (10, 2047892), (11, 1861720), (14, 1462780), (20, 1023946), (22, 930860), (28, 731390), (35, 585112), (40, 511973), (44, 465430), (55, 372344), (56, 365695), (61, 335720), (70, 292556), (77, 265960), (88, 232715), (109, 187880), (110, 186172), (122, 167860), (140, 146278), (154, 132980), (218, 93940), (220, 93086), (244, 83930), (280, 73139), (305, 67144), (308, 66490), (385, 53192), (427, 47960), (436, 46970), (440, 46543), (488, 41965), (545, 37576), (610, 33572), (616, 33245), (671, 30520), (763, 26840), (770, 26596), (854, 23980), (872, 23485), (1090, 18788), (1199, 17080), (1220, 16786), (1342, 15260), (1526, 13420), (1540, 13298), (1708, 11990), (2135, 9592), (2180, 9394), (2398, 8540), (2440, 8393), (2684, 7630), (3052, 6710), (3080, 6649), (3355, 6104), (3416, 5995), (3815, 5368), (4270, 4796), (4360, 4697)]