20387120

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19603}}^1$

素因数の和:19629

約数の個数: 40

約数和(自身を含む): 51048816

約数和(自身を除く): 30661696

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 19603, 39206, 78412, 98015, 156824, 196030, 254839, 313648, 392060, 509678, 784120, 1019356, 1274195, 1568240, 2038712, 2548390, 4077424, 5096780, 10193560, 20387120]

約数ペア:

[(1, 20387120), (2, 10193560), (4, 5096780), (5, 4077424), (8, 2548390), (10, 2038712), (13, 1568240), (16, 1274195), (20, 1019356), (26, 784120), (40, 509678), (52, 392060), (65, 313648), (80, 254839), (104, 196030), (130, 156824), (208, 98015), (260, 78412), (520, 39206), (1040, 19603)]