20784619960

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{139}}^1\times {\mathrm{287557}}^1$

素因数の和:287720

約数の個数: 64

約数和(自身を含む): 50725231200

約数和(自身を除く): 29940611240

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 139, 260, 278, 520, 556, 695, 1112, 1390, 1807, 2780, 3614, 5560, 7228, 9035, 14456, 18070, 36140, 72280, 287557, 575114, 1150228, 1437785, 2300456, 2875570, 3738241, 5751140, 7476482, 11502280, 14952964, 18691205, 29905928, 37382410, 39970423, 74764820, 79940846, 149529640, 159881692, 199852115, 319763384, 399704230, 519615499, 799408460, 1039230998, 1598816920, 2078461996, 2598077495, 4156923992, 5196154990, 10392309980, 20784619960]

約数ペア:

[(1, 20784619960), (2, 10392309980), (4, 5196154990), (5, 4156923992), (8, 2598077495), (10, 2078461996), (13, 1598816920), (20, 1039230998), (26, 799408460), (40, 519615499), (52, 399704230), (65, 319763384), (104, 199852115), (130, 159881692), (139, 149529640), (260, 79940846), (278, 74764820), (520, 39970423), (556, 37382410), (695, 29905928), (1112, 18691205), (1390, 14952964), (1807, 11502280), (2780, 7476482), (3614, 5751140), (5560, 3738241), (7228, 2875570), (9035, 2300456), (14456, 1437785), (18070, 1150228), (36140, 575114), (72280, 287557)]