21388120

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{41131}}^1$

素因数の和:41155

約数の個数: 32

約数和(自身を含む): 51826320

約数和(自身を除く): 30438200

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 260, 520, 41131, 82262, 164524, 205655, 329048, 411310, 534703, 822620, 1069406, 1645240, 2138812, 2673515, 4277624, 5347030, 10694060, 21388120]

約数ペア:

[(1, 21388120), (2, 10694060), (4, 5347030), (5, 4277624), (8, 2673515), (10, 2138812), (13, 1645240), (20, 1069406), (26, 822620), (40, 534703), (52, 411310), (65, 329048), (104, 205655), (130, 164524), (260, 82262), (520, 41131)]