81651420

素因数分解:

$2^2\times 3^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{6389}}^1$

素因数の和:6475

約数の個数: 72

約数和(自身を含む): 251203680

約数和(自身を除く): 169552260

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 71, 90, 142, 180, 213, 284, 355, 426, 639, 710, 852, 1065, 1278, 1420, 2130, 2556, 3195, 4260, 6389, 6390, 12778, 12780, 19167, 25556, 31945, 38334, 57501, 63890, 76668, 95835, 115002, 127780, 191670, 230004, 287505, 383340, 453619, 575010, 907238, 1150020, 1360857, 1814476, 2268095, 2721714, 4082571, 4536190, 5443428, 6804285, 8165142, 9072380, 13608570, 16330284, 20412855, 27217140, 40825710, 81651420]

約数ペア:

[(1, 81651420), (2, 40825710), (3, 27217140), (4, 20412855), (5, 16330284), (6, 13608570), (9, 9072380), (10, 8165142), (12, 6804285), (15, 5443428), (18, 4536190), (20, 4082571), (30, 2721714), (36, 2268095), (45, 1814476), (60, 1360857), (71, 1150020), (90, 907238), (142, 575010), (180, 453619), (213, 383340), (284, 287505), (355, 230004), (426, 191670), (639, 127780), (710, 115002), (852, 95835), (1065, 76668), (1278, 63890), (1420, 57501), (2130, 38334), (2556, 31945), (3195, 25556), (4260, 19167), (6389, 12780), (6390, 12778)]