21188128

素因数分解:

$2^5\times {\mathrm{13}}^1\times {\mathrm{31}}^2\times {\mathrm{53}}^1$

素因数の和:138

約数の個数: 72

約数和(自身を含む): 47294604

約数和(自身を除く): 26106476

約数列:

[1, 2, 4, 8, 13, 16, 26, 31, 32, 52, 53, 62, 104, 106, 124, 208, 212, 248, 403, 416, 424, 496, 689, 806, 848, 961, 992, 1378, 1612, 1643, 1696, 1922, 2756, 3224, 3286, 3844, 5512, 6448, 6572, 7688, 11024, 12493, 12896, 13144, 15376, 21359, 22048, 24986, 26288, 30752, 42718, 49972, 50933, 52576, 85436, 99944, 101866, 170872, 199888, 203732, 341744, 399776, 407464, 662129, 683488, 814928, 1324258, 1629856, 2648516, 5297032, 10594064, 21188128]

約数ペア:

[(1, 21188128), (2, 10594064), (4, 5297032), (8, 2648516), (13, 1629856), (16, 1324258), (26, 814928), (31, 683488), (32, 662129), (52, 407464), (53, 399776), (62, 341744), (104, 203732), (106, 199888), (124, 170872), (208, 101866), (212, 99944), (248, 85436), (403, 52576), (416, 50933), (424, 49972), (496, 42718), (689, 30752), (806, 26288), (848, 24986), (961, 22048), (992, 21359), (1378, 15376), (1612, 13144), (1643, 12896), (1696, 12493), (1922, 11024), (2756, 7688), (3224, 6572), (3286, 6448), (3844, 5512)]