21560240

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{20731}}^1$

素因数の和:20757

約数の個数: 40

約数和(自身を含む): 53986128

約数和(自身を除く): 32425888

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 20731, 41462, 82924, 103655, 165848, 207310, 269503, 331696, 414620, 539006, 829240, 1078012, 1347515, 1658480, 2156024, 2695030, 4312048, 5390060, 10780120, 21560240]

約数ペア:

[(1, 21560240), (2, 10780120), (4, 5390060), (5, 4312048), (8, 2695030), (10, 2156024), (13, 1658480), (16, 1347515), (20, 1078012), (26, 829240), (40, 539006), (52, 414620), (65, 331696), (80, 269503), (104, 207310), (130, 165848), (208, 103655), (260, 82924), (520, 41462), (1040, 20731)]