20801000

素因数分解:

$2^3\times 5^3\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{61}}^1$

素因数の和:124

約数の個数: 128

約数和(自身を含む): 55710720

約数和(自身を除く): 34909720

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 25, 31, 40, 44, 50, 55, 61, 62, 88, 100, 110, 122, 124, 125, 155, 200, 220, 244, 248, 250, 275, 305, 310, 341, 440, 488, 500, 550, 610, 620, 671, 682, 775, 1000, 1100, 1220, 1240, 1342, 1364, 1375, 1525, 1550, 1705, 1891, 2200, 2440, 2684, 2728, 2750, 3050, 3100, 3355, 3410, 3782, 3875, 5368, 5500, 6100, 6200, 6710, 6820, 7564, 7625, 7750, 8525, 9455, 11000, 12200, 13420, 13640, 15128, 15250, 15500, 16775, 17050, 18910, 20801, 26840, 30500, 31000, 33550, 34100, 37820, 41602, 42625, 47275, 61000, 67100, 68200, 75640, 83204, 83875, 85250, 94550, 104005, 134200, 166408, 167750, 170500, 189100, 208010, 236375, 335500, 341000, 378200, 416020, 472750, 520025, 671000, 832040, 945500, 1040050, 1891000, 2080100, 2600125, 4160200, 5200250, 10400500, 20801000]

約数ペア:

[(1, 20801000), (2, 10400500), (4, 5200250), (5, 4160200), (8, 2600125), (10, 2080100), (11, 1891000), (20, 1040050), (22, 945500), (25, 832040), (31, 671000), (40, 520025), (44, 472750), (50, 416020), (55, 378200), (61, 341000), (62, 335500), (88, 236375), (100, 208010), (110, 189100), (122, 170500), (124, 167750), (125, 166408), (155, 134200), (200, 104005), (220, 94550), (244, 85250), (248, 83875), (250, 83204), (275, 75640), (305, 68200), (310, 67100), (341, 61000), (440, 47275), (488, 42625), (500, 41602), (550, 37820), (610, 34100), (620, 33550), (671, 31000), (682, 30500), (775, 26840), (1000, 20801), (1100, 18910), (1220, 17050), (1240, 16775), (1342, 15500), (1364, 15250), (1375, 15128), (1525, 13640), (1550, 13420), (1705, 12200), (1891, 11000), (2200, 9455), (2440, 8525), (2684, 7750), (2728, 7625), (2750, 7564), (3050, 6820), (3100, 6710), (3355, 6200), (3410, 6100), (3782, 5500), (3875, 5368)]