21263320

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{103}}^1\times {\mathrm{397}}^1$

素因数の和:524

約数の個数: 64

約数和(自身を含む): 52153920

約数和(自身を除く): 30890600

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 103, 104, 130, 206, 260, 397, 412, 515, 520, 794, 824, 1030, 1339, 1588, 1985, 2060, 2678, 3176, 3970, 4120, 5161, 5356, 6695, 7940, 10322, 10712, 13390, 15880, 20644, 25805, 26780, 40891, 41288, 51610, 53560, 81782, 103220, 163564, 204455, 206440, 327128, 408910, 531583, 817820, 1063166, 1635640, 2126332, 2657915, 4252664, 5315830, 10631660, 21263320]

約数ペア:

[(1, 21263320), (2, 10631660), (4, 5315830), (5, 4252664), (8, 2657915), (10, 2126332), (13, 1635640), (20, 1063166), (26, 817820), (40, 531583), (52, 408910), (65, 327128), (103, 206440), (104, 204455), (130, 163564), (206, 103220), (260, 81782), (397, 53560), (412, 51610), (515, 41288), (520, 40891), (794, 26780), (824, 25805), (1030, 20644), (1339, 15880), (1588, 13390), (1985, 10712), (2060, 10322), (2678, 7940), (3176, 6695), (3970, 5356), (4120, 5161)]