20012980

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^2\times {\mathrm{31}}^1\times {\mathrm{191}}^1$

素因数の和:257

約数の個数: 72

約数和(自身を含む): 47222784

約数和(自身を除く): 27209804

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 31, 52, 62, 65, 124, 130, 155, 169, 191, 260, 310, 338, 382, 403, 620, 676, 764, 806, 845, 955, 1612, 1690, 1910, 2015, 2483, 3380, 3820, 4030, 4966, 5239, 5921, 8060, 9932, 10478, 11842, 12415, 20956, 23684, 24830, 26195, 29605, 32279, 49660, 52390, 59210, 64558, 76973, 104780, 118420, 129116, 153946, 161395, 307892, 322790, 384865, 645580, 769730, 1000649, 1539460, 2001298, 4002596, 5003245, 10006490, 20012980]

約数ペア:

[(1, 20012980), (2, 10006490), (4, 5003245), (5, 4002596), (10, 2001298), (13, 1539460), (20, 1000649), (26, 769730), (31, 645580), (52, 384865), (62, 322790), (65, 307892), (124, 161395), (130, 153946), (155, 129116), (169, 118420), (191, 104780), (260, 76973), (310, 64558), (338, 59210), (382, 52390), (403, 49660), (620, 32279), (676, 29605), (764, 26195), (806, 24830), (845, 23684), (955, 20956), (1612, 12415), (1690, 11842), (1910, 10478), (2015, 9932), (2483, 8060), (3380, 5921), (3820, 5239), (4030, 4966)]