21791960

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{73}}^1\times {\mathrm{439}}^1$

素因数の和:540

約数の個数: 64

約数和(自身を含む): 52747200

約数和(自身を除く): 30955240

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 73, 85, 136, 146, 170, 292, 340, 365, 439, 584, 680, 730, 878, 1241, 1460, 1756, 2195, 2482, 2920, 3512, 4390, 4964, 6205, 7463, 8780, 9928, 12410, 14926, 17560, 24820, 29852, 32047, 37315, 49640, 59704, 64094, 74630, 128188, 149260, 160235, 256376, 298520, 320470, 544799, 640940, 1089598, 1281880, 2179196, 2723995, 4358392, 5447990, 10895980, 21791960]

約数ペア:

[(1, 21791960), (2, 10895980), (4, 5447990), (5, 4358392), (8, 2723995), (10, 2179196), (17, 1281880), (20, 1089598), (34, 640940), (40, 544799), (68, 320470), (73, 298520), (85, 256376), (136, 160235), (146, 149260), (170, 128188), (292, 74630), (340, 64094), (365, 59704), (439, 49640), (584, 37315), (680, 32047), (730, 29852), (878, 24820), (1241, 17560), (1460, 14926), (1756, 12410), (2195, 9928), (2482, 8780), (2920, 7463), (3512, 6205), (4390, 4964)]