20665840

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{641}}^1$

素因数の和:698

約数の個数: 80

約数和(自身を含む): 53496576

約数和(自身を除く): 32830736

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 31, 40, 52, 62, 65, 80, 104, 124, 130, 155, 208, 248, 260, 310, 403, 496, 520, 620, 641, 806, 1040, 1240, 1282, 1612, 2015, 2480, 2564, 3205, 3224, 4030, 5128, 6410, 6448, 8060, 8333, 10256, 12820, 16120, 16666, 19871, 25640, 32240, 33332, 39742, 41665, 51280, 66664, 79484, 83330, 99355, 133328, 158968, 166660, 198710, 258323, 317936, 333320, 397420, 516646, 666640, 794840, 1033292, 1291615, 1589680, 2066584, 2583230, 4133168, 5166460, 10332920, 20665840]

約数ペア:

[(1, 20665840), (2, 10332920), (4, 5166460), (5, 4133168), (8, 2583230), (10, 2066584), (13, 1589680), (16, 1291615), (20, 1033292), (26, 794840), (31, 666640), (40, 516646), (52, 397420), (62, 333320), (65, 317936), (80, 258323), (104, 198710), (124, 166660), (130, 158968), (155, 133328), (208, 99355), (248, 83330), (260, 79484), (310, 66664), (403, 51280), (496, 41665), (520, 39742), (620, 33332), (641, 32240), (806, 25640), (1040, 19871), (1240, 16666), (1282, 16120), (1612, 12820), (2015, 10256), (2480, 8333), (2564, 8060), (3205, 6448), (3224, 6410), (4030, 5128)]