21199880

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{59}}^1\times {\mathrm{691}}^1$

素因数の和:774

約数の個数: 64

約数和(自身を含む): 52315200

約数和(自身を除く): 31115320

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 59, 65, 104, 118, 130, 236, 260, 295, 472, 520, 590, 691, 767, 1180, 1382, 1534, 2360, 2764, 3068, 3455, 3835, 5528, 6136, 6910, 7670, 8983, 13820, 15340, 17966, 27640, 30680, 35932, 40769, 44915, 71864, 81538, 89830, 163076, 179660, 203845, 326152, 359320, 407690, 529997, 815380, 1059994, 1630760, 2119988, 2649985, 4239976, 5299970, 10599940, 21199880]

約数ペア:

[(1, 21199880), (2, 10599940), (4, 5299970), (5, 4239976), (8, 2649985), (10, 2119988), (13, 1630760), (20, 1059994), (26, 815380), (40, 529997), (52, 407690), (59, 359320), (65, 326152), (104, 203845), (118, 179660), (130, 163076), (236, 89830), (260, 81538), (295, 71864), (472, 44915), (520, 40769), (590, 35932), (691, 30680), (767, 27640), (1180, 17966), (1382, 15340), (1534, 13820), (2360, 8983), (2764, 7670), (3068, 6910), (3455, 6136), (3835, 5528)]