21987018

素因数分解:

$2^1\times 3^3\times {\mathrm{17}}^1\times {\mathrm{43}}^1\times {\mathrm{557}}^1$

素因数の和:628

約数の個数: 64

約数和(自身を含む): 53032320

約数和(自身を除く): 31045302

約数列:

[1, 2, 3, 6, 9, 17, 18, 27, 34, 43, 51, 54, 86, 102, 129, 153, 258, 306, 387, 459, 557, 731, 774, 918, 1114, 1161, 1462, 1671, 2193, 2322, 3342, 4386, 5013, 6579, 9469, 10026, 13158, 15039, 18938, 19737, 23951, 28407, 30078, 39474, 47902, 56814, 71853, 85221, 143706, 170442, 215559, 255663, 407167, 431118, 511326, 646677, 814334, 1221501, 1293354, 2443002, 3664503, 7329006, 10993509, 21987018]

約数ペア:

[(1, 21987018), (2, 10993509), (3, 7329006), (6, 3664503), (9, 2443002), (17, 1293354), (18, 1221501), (27, 814334), (34, 646677), (43, 511326), (51, 431118), (54, 407167), (86, 255663), (102, 215559), (129, 170442), (153, 143706), (258, 85221), (306, 71853), (387, 56814), (459, 47902), (557, 39474), (731, 30078), (774, 28407), (918, 23951), (1114, 19737), (1161, 18938), (1462, 15039), (1671, 13158), (2193, 10026), (2322, 9469), (3342, 6579), (4386, 5013)]