21990612

素因数分解:

$2^2\times 3^1\times 7^2\times {\mathrm{149}}^1\times {\mathrm{251}}^1$

素因数の和:421

約数の個数: 72

約数和(自身を含む): 60328800

約数和(自身を除く): 38338188

約数列:

[1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 49, 84, 98, 147, 149, 196, 251, 294, 298, 447, 502, 588, 596, 753, 894, 1004, 1043, 1506, 1757, 1788, 2086, 3012, 3129, 3514, 4172, 5271, 6258, 7028, 7301, 10542, 12299, 12516, 14602, 21084, 21903, 24598, 29204, 36897, 37399, 43806, 49196, 73794, 74798, 87612, 112197, 147588, 149596, 224394, 261793, 448788, 523586, 785379, 1047172, 1570758, 1832551, 3141516, 3665102, 5497653, 7330204, 10995306, 21990612]

約数ペア:

[(1, 21990612), (2, 10995306), (3, 7330204), (4, 5497653), (6, 3665102), (7, 3141516), (12, 1832551), (14, 1570758), (21, 1047172), (28, 785379), (42, 523586), (49, 448788), (84, 261793), (98, 224394), (147, 149596), (149, 147588), (196, 112197), (251, 87612), (294, 74798), (298, 73794), (447, 49196), (502, 43806), (588, 37399), (596, 36897), (753, 29204), (894, 24598), (1004, 21903), (1043, 21084), (1506, 14602), (1757, 12516), (1788, 12299), (2086, 10542), (3012, 7301), (3129, 7028), (3514, 6258), (4172, 5271)]