21105105

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{71}}^1\times {\mathrm{149}}^1$

素因数の和:254

約数の個数: 64

約数和(自身を含む): 41472000

約数和(自身を除く): 20366895

約数列:

[1, 3, 5, 7, 15, 19, 21, 35, 57, 71, 95, 105, 133, 149, 213, 285, 355, 399, 447, 497, 665, 745, 1043, 1065, 1349, 1491, 1995, 2235, 2485, 2831, 3129, 4047, 5215, 6745, 7455, 8493, 9443, 10579, 14155, 15645, 19817, 20235, 28329, 31737, 42465, 47215, 52895, 59451, 74053, 99085, 141645, 158685, 201001, 222159, 297255, 370265, 603003, 1005005, 1110795, 1407007, 3015015, 4221021, 7035035, 21105105]

約数ペア:

[(1, 21105105), (3, 7035035), (5, 4221021), (7, 3015015), (15, 1407007), (19, 1110795), (21, 1005005), (35, 603003), (57, 370265), (71, 297255), (95, 222159), (105, 201001), (133, 158685), (149, 141645), (213, 99085), (285, 74053), (355, 59451), (399, 52895), (447, 47215), (497, 42465), (665, 31737), (745, 28329), (1043, 20235), (1065, 19817), (1349, 15645), (1491, 14155), (1995, 10579), (2235, 9443), (2485, 8493), (2831, 7455), (3129, 6745), (4047, 5215)]