21978918

素因数分解:

$2^1\times 3^3\times {\mathrm{13}}^1\times {\mathrm{131}}^1\times {\mathrm{239}}^1$

素因数の和:394

約数の個数: 64

約数和(自身を含む): 53222400

約数和(自身を除く): 31243482

約数列:

[1, 2, 3, 6, 9, 13, 18, 26, 27, 39, 54, 78, 117, 131, 234, 239, 262, 351, 393, 478, 702, 717, 786, 1179, 1434, 1703, 2151, 2358, 3107, 3406, 3537, 4302, 5109, 6214, 6453, 7074, 9321, 10218, 12906, 15327, 18642, 27963, 30654, 31309, 45981, 55926, 62618, 83889, 91962, 93927, 167778, 187854, 281781, 407017, 563562, 814034, 845343, 1221051, 1690686, 2442102, 3663153, 7326306, 10989459, 21978918]

約数ペア:

[(1, 21978918), (2, 10989459), (3, 7326306), (6, 3663153), (9, 2442102), (13, 1690686), (18, 1221051), (26, 845343), (27, 814034), (39, 563562), (54, 407017), (78, 281781), (117, 187854), (131, 167778), (234, 93927), (239, 91962), (262, 83889), (351, 62618), (393, 55926), (478, 45981), (702, 31309), (717, 30654), (786, 27963), (1179, 18642), (1434, 15327), (1703, 12906), (2151, 10218), (2358, 9321), (3107, 7074), (3406, 6453), (3537, 6214), (4302, 5109)]