20881520

素因数分解:

$2^4\times 5^1\times {\mathrm{11}}^1\times {\mathrm{61}}^1\times {\mathrm{389}}^1$

素因数の和:474

約数の個数: 80

約数和(自身を含む): 53969760

約数和(自身を除く): 33088240

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 40, 44, 55, 61, 80, 88, 110, 122, 176, 220, 244, 305, 389, 440, 488, 610, 671, 778, 880, 976, 1220, 1342, 1556, 1945, 2440, 2684, 3112, 3355, 3890, 4279, 4880, 5368, 6224, 6710, 7780, 8558, 10736, 13420, 15560, 17116, 21395, 23729, 26840, 31120, 34232, 42790, 47458, 53680, 68464, 85580, 94916, 118645, 171160, 189832, 237290, 261019, 342320, 379664, 474580, 522038, 949160, 1044076, 1305095, 1898320, 2088152, 2610190, 4176304, 5220380, 10440760, 20881520]

約数ペア:

[(1, 20881520), (2, 10440760), (4, 5220380), (5, 4176304), (8, 2610190), (10, 2088152), (11, 1898320), (16, 1305095), (20, 1044076), (22, 949160), (40, 522038), (44, 474580), (55, 379664), (61, 342320), (80, 261019), (88, 237290), (110, 189832), (122, 171160), (176, 118645), (220, 94916), (244, 85580), (305, 68464), (389, 53680), (440, 47458), (488, 42790), (610, 34232), (671, 31120), (778, 26840), (880, 23729), (976, 21395), (1220, 17116), (1342, 15560), (1556, 13420), (1945, 10736), (2440, 8558), (2684, 7780), (3112, 6710), (3355, 6224), (3890, 5368), (4279, 4880)]