81221220

素因数分解:

$2^2\times 3^2\times 5^1\times {\mathrm{491}}^1\times {\mathrm{919}}^1$

素因数の和:1425

約数の個数: 72

約数和(自身を含む): 247141440

約数和(自身を除く): 165920220

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, 180, 491, 919, 982, 1473, 1838, 1964, 2455, 2757, 2946, 3676, 4419, 4595, 4910, 5514, 5892, 7365, 8271, 8838, 9190, 9820, 11028, 13785, 14730, 16542, 17676, 18380, 22095, 27570, 29460, 33084, 41355, 44190, 55140, 82710, 88380, 165420, 451229, 902458, 1353687, 1804916, 2256145, 2707374, 4061061, 4512290, 5414748, 6768435, 8122122, 9024580, 13536870, 16244244, 20305305, 27073740, 40610610, 81221220]

約数ペア:

[(1, 81221220), (2, 40610610), (3, 27073740), (4, 20305305), (5, 16244244), (6, 13536870), (9, 9024580), (10, 8122122), (12, 6768435), (15, 5414748), (18, 4512290), (20, 4061061), (30, 2707374), (36, 2256145), (45, 1804916), (60, 1353687), (90, 902458), (180, 451229), (491, 165420), (919, 88380), (982, 82710), (1473, 55140), (1838, 44190), (1964, 41355), (2455, 33084), (2757, 29460), (2946, 27570), (3676, 22095), (4419, 18380), (4595, 17676), (4910, 16542), (5514, 14730), (5892, 13785), (7365, 11028), (8271, 9820), (8838, 9190)]