21102640

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{103}}^1\times {\mathrm{197}}^1$

素因数の和:326

約数の個数: 80

約数和(自身を含む): 53621568

約数和(自身を除く): 32518928

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 103, 104, 130, 197, 206, 208, 260, 394, 412, 515, 520, 788, 824, 985, 1030, 1040, 1339, 1576, 1648, 1970, 2060, 2561, 2678, 3152, 3940, 4120, 5122, 5356, 6695, 7880, 8240, 10244, 10712, 12805, 13390, 15760, 20291, 20488, 21424, 25610, 26780, 40582, 40976, 51220, 53560, 81164, 101455, 102440, 107120, 162328, 202910, 204880, 263783, 324656, 405820, 527566, 811640, 1055132, 1318915, 1623280, 2110264, 2637830, 4220528, 5275660, 10551320, 21102640]

約数ペア:

[(1, 21102640), (2, 10551320), (4, 5275660), (5, 4220528), (8, 2637830), (10, 2110264), (13, 1623280), (16, 1318915), (20, 1055132), (26, 811640), (40, 527566), (52, 405820), (65, 324656), (80, 263783), (103, 204880), (104, 202910), (130, 162328), (197, 107120), (206, 102440), (208, 101455), (260, 81164), (394, 53560), (412, 51220), (515, 40976), (520, 40582), (788, 26780), (824, 25610), (985, 21424), (1030, 20488), (1040, 20291), (1339, 15760), (1576, 13390), (1648, 12805), (1970, 10712), (2060, 10244), (2561, 8240), (2678, 7880), (3152, 6695), (3940, 5356), (4120, 5122)]