18868520

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{37}}^1\times {\mathrm{61}}^1$

素因数の和:139

約数の個数: 128

約数和(自身を含む): 50889600

約数和(自身を除く): 32021080

約数列:

[1, 2, 4, 5, 8, 10, 11, 19, 20, 22, 37, 38, 40, 44, 55, 61, 74, 76, 88, 95, 110, 122, 148, 152, 185, 190, 209, 220, 244, 296, 305, 370, 380, 407, 418, 440, 488, 610, 671, 703, 740, 760, 814, 836, 1045, 1159, 1220, 1342, 1406, 1480, 1628, 1672, 2035, 2090, 2257, 2318, 2440, 2684, 2812, 3256, 3355, 3515, 4070, 4180, 4514, 4636, 5368, 5624, 5795, 6710, 7030, 7733, 8140, 8360, 9028, 9272, 11285, 11590, 12749, 13420, 14060, 15466, 16280, 18056, 22570, 23180, 24827, 25498, 26840, 28120, 30932, 38665, 42883, 45140, 46360, 49654, 50996, 61864, 63745, 77330, 85766, 90280, 99308, 101992, 124135, 127490, 154660, 171532, 198616, 214415, 248270, 254980, 309320, 343064, 428830, 471713, 496540, 509960, 857660, 943426, 993080, 1715320, 1886852, 2358565, 3773704, 4717130, 9434260, 18868520]

約数ペア:

[(1, 18868520), (2, 9434260), (4, 4717130), (5, 3773704), (8, 2358565), (10, 1886852), (11, 1715320), (19, 993080), (20, 943426), (22, 857660), (37, 509960), (38, 496540), (40, 471713), (44, 428830), (55, 343064), (61, 309320), (74, 254980), (76, 248270), (88, 214415), (95, 198616), (110, 171532), (122, 154660), (148, 127490), (152, 124135), (185, 101992), (190, 99308), (209, 90280), (220, 85766), (244, 77330), (296, 63745), (305, 61864), (370, 50996), (380, 49654), (407, 46360), (418, 45140), (440, 42883), (488, 38665), (610, 30932), (671, 28120), (703, 26840), (740, 25498), (760, 24827), (814, 23180), (836, 22570), (1045, 18056), (1159, 16280), (1220, 15466), (1342, 14060), (1406, 13420), (1480, 12749), (1628, 11590), (1672, 11285), (2035, 9272), (2090, 9028), (2257, 8360), (2318, 8140), (2440, 7733), (2684, 7030), (2812, 6710), (3256, 5795), (3355, 5624), (3515, 5368), (4070, 4636), (4180, 4514)]