18880720

素因数分解:

$2^4\times 5^1\times {\mathrm{53}}^1\times {\mathrm{61}}^1\times {\mathrm{73}}^1$

素因数の和:200

約数の個数: 80

約数和(自身を含む): 46081872

約数和(自身を除く): 27201152

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 53, 61, 73, 80, 106, 122, 146, 212, 244, 265, 292, 305, 365, 424, 488, 530, 584, 610, 730, 848, 976, 1060, 1168, 1220, 1460, 2120, 2440, 2920, 3233, 3869, 4240, 4453, 4880, 5840, 6466, 7738, 8906, 12932, 15476, 16165, 17812, 19345, 22265, 25864, 30952, 32330, 35624, 38690, 44530, 51728, 61904, 64660, 71248, 77380, 89060, 129320, 154760, 178120, 236009, 258640, 309520, 356240, 472018, 944036, 1180045, 1888072, 2360090, 3776144, 4720180, 9440360, 18880720]

約数ペア:

[(1, 18880720), (2, 9440360), (4, 4720180), (5, 3776144), (8, 2360090), (10, 1888072), (16, 1180045), (20, 944036), (40, 472018), (53, 356240), (61, 309520), (73, 258640), (80, 236009), (106, 178120), (122, 154760), (146, 129320), (212, 89060), (244, 77380), (265, 71248), (292, 64660), (305, 61904), (365, 51728), (424, 44530), (488, 38690), (530, 35624), (584, 32330), (610, 30952), (730, 25864), (848, 22265), (976, 19345), (1060, 17812), (1168, 16165), (1220, 15476), (1460, 12932), (2120, 8906), (2440, 7738), (2920, 6466), (3233, 5840), (3869, 4880), (4240, 4453)]