21320488

素因数分解:

$2^3\times 7^2\times {\mathrm{137}}^1\times {\mathrm{397}}^1$

素因数の和:554

約数の個数: 48

約数和(自身を含む): 46960020

約数和(自身を除く): 25639532

約数列:

[1, 2, 4, 7, 8, 14, 28, 49, 56, 98, 137, 196, 274, 392, 397, 548, 794, 959, 1096, 1588, 1918, 2779, 3176, 3836, 5558, 6713, 7672, 11116, 13426, 19453, 22232, 26852, 38906, 53704, 54389, 77812, 108778, 155624, 217556, 380723, 435112, 761446, 1522892, 2665061, 3045784, 5330122, 10660244, 21320488]

約数ペア:

[(1, 21320488), (2, 10660244), (4, 5330122), (7, 3045784), (8, 2665061), (14, 1522892), (28, 761446), (49, 435112), (56, 380723), (98, 217556), (137, 155624), (196, 108778), (274, 77812), (392, 54389), (397, 53704), (548, 38906), (794, 26852), (959, 22232), (1096, 19453), (1588, 13426), (1918, 11116), (2779, 7672), (3176, 6713), (3836, 5558)]