643542640

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{19961}}^1$

素因数の和:20018

約数の個数: 80

約数和(自身を含む): 1663393536

約数和(自身を除く): 1019850896

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, 806, 1040, 1240, 1612, 2015, 2480, 3224, 4030, 6448, 8060, 16120, 19961, 32240, 39922, 79844, 99805, 159688, 199610, 259493, 319376, 399220, 518986, 618791, 798440, 1037972, 1237582, 1297465, 1596880, 2075944, 2475164, 2594930, 3093955, 4151888, 4950328, 5189860, 6187910, 8044283, 9900656, 10379720, 12375820, 16088566, 20759440, 24751640, 32177132, 40221415, 49503280, 64354264, 80442830, 128708528, 160885660, 321771320, 643542640]

約数ペア:

[(1, 643542640), (2, 321771320), (4, 160885660), (5, 128708528), (8, 80442830), (10, 64354264), (13, 49503280), (16, 40221415), (20, 32177132), (26, 24751640), (31, 20759440), (40, 16088566), (52, 12375820), (62, 10379720), (65, 9900656), (80, 8044283), (104, 6187910), (124, 5189860), (130, 4950328), (155, 4151888), (208, 3093955), (248, 2594930), (260, 2475164), (310, 2075944), (403, 1596880), (496, 1297465), (520, 1237582), (620, 1037972), (806, 798440), (1040, 618791), (1240, 518986), (1612, 399220), (2015, 319376), (2480, 259493), (3224, 199610), (4030, 159688), (6448, 99805), (8060, 79844), (16120, 39922), (19961, 32240)]