81517940

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{59}}^1\times {\mathrm{71}}^1\times {\mathrm{139}}^1$

素因数の和:285

約数の個数: 96

約数和(自身を含む): 203212800

約数和(自身を除く): 121694860

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 59, 70, 71, 118, 139, 140, 142, 236, 278, 284, 295, 355, 413, 497, 556, 590, 695, 710, 826, 973, 994, 1180, 1390, 1420, 1652, 1946, 1988, 2065, 2485, 2780, 3892, 4130, 4189, 4865, 4970, 8201, 8260, 8378, 9730, 9869, 9940, 16402, 16756, 19460, 19738, 20945, 29323, 32804, 39476, 41005, 41890, 49345, 57407, 58646, 69083, 82010, 83780, 98690, 114814, 117292, 138166, 146615, 164020, 197380, 229628, 276332, 287035, 293230, 345415, 574070, 582271, 586460, 690830, 1148140, 1164542, 1381660, 2329084, 2911355, 4075897, 5822710, 8151794, 11645420, 16303588, 20379485, 40758970, 81517940]

約数ペア:

[(1, 81517940), (2, 40758970), (4, 20379485), (5, 16303588), (7, 11645420), (10, 8151794), (14, 5822710), (20, 4075897), (28, 2911355), (35, 2329084), (59, 1381660), (70, 1164542), (71, 1148140), (118, 690830), (139, 586460), (140, 582271), (142, 574070), (236, 345415), (278, 293230), (284, 287035), (295, 276332), (355, 229628), (413, 197380), (497, 164020), (556, 146615), (590, 138166), (695, 117292), (710, 114814), (826, 98690), (973, 83780), (994, 82010), (1180, 69083), (1390, 58646), (1420, 57407), (1652, 49345), (1946, 41890), (1988, 41005), (2065, 39476), (2485, 32804), (2780, 29323), (3892, 20945), (4130, 19738), (4189, 19460), (4865, 16756), (4970, 16402), (8201, 9940), (8260, 9869), (8378, 9730)]