21518420

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{89}}^1\times {\mathrm{157}}^1$

素因数の和:273

約数の個数: 96

約数和(自身を含む): 57335040

約数和(自身を除く): 35816620

約数列:

[1, 2, 4, 5, 7, 10, 11, 14, 20, 22, 28, 35, 44, 55, 70, 77, 89, 110, 140, 154, 157, 178, 220, 308, 314, 356, 385, 445, 623, 628, 770, 785, 890, 979, 1099, 1246, 1540, 1570, 1727, 1780, 1958, 2198, 2492, 3115, 3140, 3454, 3916, 4396, 4895, 5495, 6230, 6853, 6908, 8635, 9790, 10990, 12089, 12460, 13706, 13973, 17270, 19580, 21980, 24178, 27412, 27946, 34265, 34540, 48356, 55892, 60445, 68530, 69865, 97811, 120890, 137060, 139730, 153703, 195622, 241780, 279460, 307406, 391244, 489055, 614812, 768515, 978110, 1075921, 1537030, 1956220, 2151842, 3074060, 4303684, 5379605, 10759210, 21518420]

約数ペア:

[(1, 21518420), (2, 10759210), (4, 5379605), (5, 4303684), (7, 3074060), (10, 2151842), (11, 1956220), (14, 1537030), (20, 1075921), (22, 978110), (28, 768515), (35, 614812), (44, 489055), (55, 391244), (70, 307406), (77, 279460), (89, 241780), (110, 195622), (140, 153703), (154, 139730), (157, 137060), (178, 120890), (220, 97811), (308, 69865), (314, 68530), (356, 60445), (385, 55892), (445, 48356), (623, 34540), (628, 34265), (770, 27946), (785, 27412), (890, 24178), (979, 21980), (1099, 19580), (1246, 17270), (1540, 13973), (1570, 13706), (1727, 12460), (1780, 12089), (1958, 10990), (2198, 9790), (2492, 8635), (3115, 6908), (3140, 6853), (3454, 6230), (3916, 5495), (4396, 4895)]