21081720

素因数分解:

$2^3\times 3^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{15971}}^1$

素因数の和:15996

約数の個数: 64

約数和(自身を含む): 68999040

約数和(自身を除く): 47917320

約数列:

[1, 2, 3, 4, 5, 6, 8, 10, 11, 12, 15, 20, 22, 24, 30, 33, 40, 44, 55, 60, 66, 88, 110, 120, 132, 165, 220, 264, 330, 440, 660, 1320, 15971, 31942, 47913, 63884, 79855, 95826, 127768, 159710, 175681, 191652, 239565, 319420, 351362, 383304, 479130, 527043, 638840, 702724, 878405, 958260, 1054086, 1405448, 1756810, 1916520, 2108172, 2635215, 3513620, 4216344, 5270430, 7027240, 10540860, 21081720]

約数ペア:

[(1, 21081720), (2, 10540860), (3, 7027240), (4, 5270430), (5, 4216344), (6, 3513620), (8, 2635215), (10, 2108172), (11, 1916520), (12, 1756810), (15, 1405448), (20, 1054086), (22, 958260), (24, 878405), (30, 702724), (33, 638840), (40, 527043), (44, 479130), (55, 383304), (60, 351362), (66, 319420), (88, 239565), (110, 191652), (120, 175681), (132, 159710), (165, 127768), (220, 95826), (264, 79855), (330, 63884), (440, 47913), (660, 31942), (1320, 15971)]