21455180

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{131}}^1\times {\mathrm{431}}^1$

素因数の和:590

約数の個数: 48

約数和(自身を含む): 47900160

約数和(自身を除く): 26444980

約数列:

[1, 2, 4, 5, 10, 19, 20, 38, 76, 95, 131, 190, 262, 380, 431, 524, 655, 862, 1310, 1724, 2155, 2489, 2620, 4310, 4978, 8189, 8620, 9956, 12445, 16378, 24890, 32756, 40945, 49780, 56461, 81890, 112922, 163780, 225844, 282305, 564610, 1072759, 1129220, 2145518, 4291036, 5363795, 10727590, 21455180]

約数ペア:

[(1, 21455180), (2, 10727590), (4, 5363795), (5, 4291036), (10, 2145518), (19, 1129220), (20, 1072759), (38, 564610), (76, 282305), (95, 225844), (131, 163780), (190, 112922), (262, 81890), (380, 56461), (431, 49780), (524, 40945), (655, 32756), (862, 24890), (1310, 16378), (1724, 12445), (2155, 9956), (2489, 8620), (2620, 8189), (4310, 4978)]