21909940

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{4957}}^1$

素因数の和:4996

約数の個数: 48

約数和(自身を含む): 52475472

約数和(自身を除く): 30565532

約数列:

[1, 2, 4, 5, 10, 13, 17, 20, 26, 34, 52, 65, 68, 85, 130, 170, 221, 260, 340, 442, 884, 1105, 2210, 4420, 4957, 9914, 19828, 24785, 49570, 64441, 84269, 99140, 128882, 168538, 257764, 322205, 337076, 421345, 644410, 842690, 1095497, 1288820, 1685380, 2190994, 4381988, 5477485, 10954970, 21909940]

約数ペア:

[(1, 21909940), (2, 10954970), (4, 5477485), (5, 4381988), (10, 2190994), (13, 1685380), (17, 1288820), (20, 1095497), (26, 842690), (34, 644410), (52, 421345), (65, 337076), (68, 322205), (85, 257764), (130, 168538), (170, 128882), (221, 99140), (260, 84269), (340, 64441), (442, 49570), (884, 24785), (1105, 19828), (2210, 9914), (4420, 4957)]