21317725

素因数分解:

$5^2\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{67}}^1\times {\mathrm{89}}^1$

素因数の和:190

約数の個数: 48

約数和(自身を含む): 31872960

約数和(自身を除く): 10555235

約数列:

[1, 5, 11, 13, 25, 55, 65, 67, 89, 143, 275, 325, 335, 445, 715, 737, 871, 979, 1157, 1675, 2225, 3575, 3685, 4355, 4895, 5785, 5963, 9581, 12727, 18425, 21775, 24475, 28925, 29815, 47905, 63635, 65593, 77519, 149075, 239525, 318175, 327965, 387595, 852709, 1639825, 1937975, 4263545, 21317725]

約数ペア:

[(1, 21317725), (5, 4263545), (11, 1937975), (13, 1639825), (25, 852709), (55, 387595), (65, 327965), (67, 318175), (89, 239525), (143, 149075), (275, 77519), (325, 65593), (335, 63635), (445, 47905), (715, 29815), (737, 28925), (871, 24475), (979, 21775), (1157, 18425), (1675, 12727), (2225, 9581), (3575, 5963), (3685, 5785), (4355, 4895)]