21220680

素因数分解:

$2^3\times 3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{61}}^1\times {\mathrm{223}}^1$

素因数の和:311

約数の個数: 128

約数和(自身を含む): 69995520

約数和(自身を除く): 48774840

約数列:

[1, 2, 3, 4, 5, 6, 8, 10, 12, 13, 15, 20, 24, 26, 30, 39, 40, 52, 60, 61, 65, 78, 104, 120, 122, 130, 156, 183, 195, 223, 244, 260, 305, 312, 366, 390, 446, 488, 520, 610, 669, 732, 780, 793, 892, 915, 1115, 1220, 1338, 1464, 1560, 1586, 1784, 1830, 2230, 2379, 2440, 2676, 2899, 3172, 3345, 3660, 3965, 4460, 4758, 5352, 5798, 6344, 6690, 7320, 7930, 8697, 8920, 9516, 11596, 11895, 13380, 13603, 14495, 15860, 17394, 19032, 23192, 23790, 26760, 27206, 28990, 31720, 34788, 40809, 43485, 47580, 54412, 57980, 68015, 69576, 81618, 86970, 95160, 108824, 115960, 136030, 163236, 173940, 176839, 204045, 272060, 326472, 347880, 353678, 408090, 530517, 544120, 707356, 816180, 884195, 1061034, 1414712, 1632360, 1768390, 2122068, 2652585, 3536780, 4244136, 5305170, 7073560, 10610340, 21220680]

約数ペア:

[(1, 21220680), (2, 10610340), (3, 7073560), (4, 5305170), (5, 4244136), (6, 3536780), (8, 2652585), (10, 2122068), (12, 1768390), (13, 1632360), (15, 1414712), (20, 1061034), (24, 884195), (26, 816180), (30, 707356), (39, 544120), (40, 530517), (52, 408090), (60, 353678), (61, 347880), (65, 326472), (78, 272060), (104, 204045), (120, 176839), (122, 173940), (130, 163236), (156, 136030), (183, 115960), (195, 108824), (223, 95160), (244, 86970), (260, 81618), (305, 69576), (312, 68015), (366, 57980), (390, 54412), (446, 47580), (488, 43485), (520, 40809), (610, 34788), (669, 31720), (732, 28990), (780, 27206), (793, 26760), (892, 23790), (915, 23192), (1115, 19032), (1220, 17394), (1338, 15860), (1464, 14495), (1560, 13603), (1586, 13380), (1784, 11895), (1830, 11596), (2230, 9516), (2379, 8920), (2440, 8697), (2676, 7930), (2899, 7320), (3172, 6690), (3345, 6344), (3660, 5798), (3965, 5352), (4460, 4758)]