21912040

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{41}}^1\times {\mathrm{431}}^1$

素因数の和:514

約数の個数: 64

約数和(自身を含む): 52254720

約数和(自身を除く): 30342680

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 41, 62, 82, 124, 155, 164, 205, 248, 310, 328, 410, 431, 620, 820, 862, 1240, 1271, 1640, 1724, 2155, 2542, 3448, 4310, 5084, 6355, 8620, 10168, 12710, 13361, 17240, 17671, 25420, 26722, 35342, 50840, 53444, 66805, 70684, 88355, 106888, 133610, 141368, 176710, 267220, 353420, 534440, 547801, 706840, 1095602, 2191204, 2739005, 4382408, 5478010, 10956020, 21912040]

約数ペア:

[(1, 21912040), (2, 10956020), (4, 5478010), (5, 4382408), (8, 2739005), (10, 2191204), (20, 1095602), (31, 706840), (40, 547801), (41, 534440), (62, 353420), (82, 267220), (124, 176710), (155, 141368), (164, 133610), (205, 106888), (248, 88355), (310, 70684), (328, 66805), (410, 53444), (431, 50840), (620, 35342), (820, 26722), (862, 25420), (1240, 17671), (1271, 17240), (1640, 13361), (1724, 12710), (2155, 10168), (2542, 8620), (3448, 6355), (4310, 5084)]