21289970

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{389}}^1\times {\mathrm{421}}^1$

素因数の和:830

約数の個数: 32

約数和(自身を含む): 41474160

約数和(自身を除く): 20184190

約数列:

[1, 2, 5, 10, 13, 26, 65, 130, 389, 421, 778, 842, 1945, 2105, 3890, 4210, 5057, 5473, 10114, 10946, 25285, 27365, 50570, 54730, 163769, 327538, 818845, 1637690, 2128997, 4257994, 10644985, 21289970]

約数ペア:

[(1, 21289970), (2, 10644985), (5, 4257994), (10, 2128997), (13, 1637690), (26, 818845), (65, 327538), (130, 163769), (389, 54730), (421, 50570), (778, 27365), (842, 25285), (1945, 10946), (2105, 10114), (3890, 5473), (4210, 5057)]