20021560

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{139}}^1\times {\mathrm{277}}^1$

素因数の和:440

約数の個数: 64

約数和(自身を含む): 49039200

約数和(自身を除く): 29017640

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 139, 260, 277, 278, 520, 554, 556, 695, 1108, 1112, 1385, 1390, 1807, 2216, 2770, 2780, 3601, 3614, 5540, 5560, 7202, 7228, 9035, 11080, 14404, 14456, 18005, 18070, 28808, 36010, 36140, 38503, 72020, 72280, 77006, 144040, 154012, 192515, 308024, 385030, 500539, 770060, 1001078, 1540120, 2002156, 2502695, 4004312, 5005390, 10010780, 20021560]

約数ペア:

[(1, 20021560), (2, 10010780), (4, 5005390), (5, 4004312), (8, 2502695), (10, 2002156), (13, 1540120), (20, 1001078), (26, 770060), (40, 500539), (52, 385030), (65, 308024), (104, 192515), (130, 154012), (139, 144040), (260, 77006), (277, 72280), (278, 72020), (520, 38503), (554, 36140), (556, 36010), (695, 28808), (1108, 18070), (1112, 18005), (1385, 14456), (1390, 14404), (1807, 11080), (2216, 9035), (2770, 7228), (2780, 7202), (3601, 5560), (3614, 5540)]