21000638916

素因数分解:

$2^2\times 3^2\times {\mathrm{197}}^1\times {\mathrm{739}}^1\times {\mathrm{4007}}^1$

素因数の和:4953

約数の個数: 72

約数和(自身を含む): 53439946560

約数和(自身を除く): 32439307644

約数列:

[1, 2, 3, 4, 6, 9, 12, 18, 36, 197, 394, 591, 739, 788, 1182, 1478, 1773, 2217, 2364, 2956, 3546, 4007, 4434, 6651, 7092, 8014, 8868, 12021, 13302, 16028, 24042, 26604, 36063, 48084, 72126, 144252, 145583, 291166, 436749, 582332, 789379, 873498, 1310247, 1578758, 1746996, 2368137, 2620494, 2961173, 3157516, 4736274, 5240988, 5922346, 7104411, 8883519, 9472548, 11844692, 14208822, 17767038, 26650557, 28417644, 35534076, 53301114, 106602228, 583351081, 1166702162, 1750053243, 2333404324, 3500106486, 5250159729, 7000212972, 10500319458, 21000638916]

約数ペア:

[(1, 21000638916), (2, 10500319458), (3, 7000212972), (4, 5250159729), (6, 3500106486), (9, 2333404324), (12, 1750053243), (18, 1166702162), (36, 583351081), (197, 106602228), (394, 53301114), (591, 35534076), (739, 28417644), (788, 26650557), (1182, 17767038), (1478, 14208822), (1773, 11844692), (2217, 9472548), (2364, 8883519), (2956, 7104411), (3546, 5922346), (4007, 5240988), (4434, 4736274), (6651, 3157516), (7092, 2961173), (8014, 2620494), (8868, 2368137), (12021, 1746996), (13302, 1578758), (16028, 1310247), (24042, 873498), (26604, 789379), (36063, 582332), (48084, 436749), (72126, 291166), (144252, 145583)]