21310640

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{661}}^1$

素因数の和:718

約数の個数: 80

約数和(自身を含む): 55163136

約数和(自身を除く): 33852496

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, 661, 806, 1040, 1240, 1322, 1612, 2015, 2480, 2644, 3224, 3305, 4030, 5288, 6448, 6610, 8060, 8593, 10576, 13220, 16120, 17186, 20491, 26440, 32240, 34372, 40982, 42965, 52880, 68744, 81964, 85930, 102455, 137488, 163928, 171860, 204910, 266383, 327856, 343720, 409820, 532766, 687440, 819640, 1065532, 1331915, 1639280, 2131064, 2663830, 4262128, 5327660, 10655320, 21310640]

約数ペア:

[(1, 21310640), (2, 10655320), (4, 5327660), (5, 4262128), (8, 2663830), (10, 2131064), (13, 1639280), (16, 1331915), (20, 1065532), (26, 819640), (31, 687440), (40, 532766), (52, 409820), (62, 343720), (65, 327856), (80, 266383), (104, 204910), (124, 171860), (130, 163928), (155, 137488), (208, 102455), (248, 85930), (260, 81964), (310, 68744), (403, 52880), (496, 42965), (520, 40982), (620, 34372), (661, 32240), (806, 26440), (1040, 20491), (1240, 17186), (1322, 16120), (1612, 13220), (2015, 10576), (2480, 8593), (2644, 8060), (3224, 6610), (3305, 6448), (4030, 5288)]