21236540

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^2\times {\mathrm{61}}^1\times {\mathrm{103}}^1$

素因数の和:199

約数の個数: 72

約数和(自身を含む): 49559328

約数和(自身を除く): 28322788

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 61, 65, 103, 122, 130, 169, 206, 244, 260, 305, 338, 412, 515, 610, 676, 793, 845, 1030, 1220, 1339, 1586, 1690, 2060, 2678, 3172, 3380, 3965, 5356, 6283, 6695, 7930, 10309, 12566, 13390, 15860, 17407, 20618, 25132, 26780, 31415, 34814, 41236, 51545, 62830, 69628, 81679, 87035, 103090, 125660, 163358, 174070, 206180, 326716, 348140, 408395, 816790, 1061827, 1633580, 2123654, 4247308, 5309135, 10618270, 21236540]

約数ペア:

[(1, 21236540), (2, 10618270), (4, 5309135), (5, 4247308), (10, 2123654), (13, 1633580), (20, 1061827), (26, 816790), (52, 408395), (61, 348140), (65, 326716), (103, 206180), (122, 174070), (130, 163358), (169, 125660), (206, 103090), (244, 87035), (260, 81679), (305, 69628), (338, 62830), (412, 51545), (515, 41236), (610, 34814), (676, 31415), (793, 26780), (845, 25132), (1030, 20618), (1220, 17407), (1339, 15860), (1586, 13390), (1690, 12566), (2060, 10309), (2678, 7930), (3172, 6695), (3380, 6283), (3965, 5356)]