21720140

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{139}}^1\times {\mathrm{601}}^1$

素因数の和:762

約数の個数: 48

約数和(自身を含む): 49556640

約数和(自身を除く): 27836500

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 139, 260, 278, 556, 601, 695, 1202, 1390, 1807, 2404, 2780, 3005, 3614, 6010, 7228, 7813, 9035, 12020, 15626, 18070, 31252, 36140, 39065, 78130, 83539, 156260, 167078, 334156, 417695, 835390, 1086007, 1670780, 2172014, 4344028, 5430035, 10860070, 21720140]

約数ペア:

[(1, 21720140), (2, 10860070), (4, 5430035), (5, 4344028), (10, 2172014), (13, 1670780), (20, 1086007), (26, 835390), (52, 417695), (65, 334156), (130, 167078), (139, 156260), (260, 83539), (278, 78130), (556, 39065), (601, 36140), (695, 31252), (1202, 18070), (1390, 15626), (1807, 12020), (2404, 9035), (2780, 7813), (3005, 7228), (3614, 6010)]