20943440

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{149}}^1\times {\mathrm{251}}^1$

素因数の和:420

約数の個数: 80

約数和(自身を含む): 56246400

約数和(自身を除く): 35302960

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 56, 70, 80, 112, 140, 149, 251, 280, 298, 502, 560, 596, 745, 1004, 1043, 1192, 1255, 1490, 1757, 2008, 2086, 2384, 2510, 2980, 3514, 4016, 4172, 5020, 5215, 5960, 7028, 8344, 8785, 10040, 10430, 11920, 14056, 16688, 17570, 20080, 20860, 28112, 35140, 37399, 41720, 70280, 74798, 83440, 140560, 149596, 186995, 261793, 299192, 373990, 523586, 598384, 747980, 1047172, 1308965, 1495960, 2094344, 2617930, 2991920, 4188688, 5235860, 10471720, 20943440]

約数ペア:

[(1, 20943440), (2, 10471720), (4, 5235860), (5, 4188688), (7, 2991920), (8, 2617930), (10, 2094344), (14, 1495960), (16, 1308965), (20, 1047172), (28, 747980), (35, 598384), (40, 523586), (56, 373990), (70, 299192), (80, 261793), (112, 186995), (140, 149596), (149, 140560), (251, 83440), (280, 74798), (298, 70280), (502, 41720), (560, 37399), (596, 35140), (745, 28112), (1004, 20860), (1043, 20080), (1192, 17570), (1255, 16688), (1490, 14056), (1757, 11920), (2008, 10430), (2086, 10040), (2384, 8785), (2510, 8344), (2980, 7028), (3514, 5960), (4016, 5215), (4172, 5020)]