21213720

素因数分解:

$2^3\times 3^2\times 5^1\times {\mathrm{11}}^2\times {\mathrm{487}}^1$

素因数の和:526

約数の個数: 144

約数和(自身を含む): 75937680

約数和(自身を除く): 54723960

約数列:

[1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 15, 18, 20, 22, 24, 30, 33, 36, 40, 44, 45, 55, 60, 66, 72, 88, 90, 99, 110, 120, 121, 132, 165, 180, 198, 220, 242, 264, 330, 360, 363, 396, 440, 484, 487, 495, 605, 660, 726, 792, 968, 974, 990, 1089, 1210, 1320, 1452, 1461, 1815, 1948, 1980, 2178, 2420, 2435, 2904, 2922, 3630, 3896, 3960, 4356, 4383, 4840, 4870, 5357, 5445, 5844, 7260, 7305, 8712, 8766, 9740, 10714, 10890, 11688, 14520, 14610, 16071, 17532, 19480, 21428, 21780, 21915, 26785, 29220, 32142, 35064, 42856, 43560, 43830, 48213, 53570, 58440, 58927, 64284, 80355, 87660, 96426, 107140, 117854, 128568, 160710, 175320, 176781, 192852, 214280, 235708, 241065, 294635, 321420, 353562, 385704, 471416, 482130, 530343, 589270, 642840, 707124, 883905, 964260, 1060686, 1178540, 1414248, 1767810, 1928520, 2121372, 2357080, 2651715, 3535620, 4242744, 5303430, 7071240, 10606860, 21213720]

約数ペア:

[(1, 21213720), (2, 10606860), (3, 7071240), (4, 5303430), (5, 4242744), (6, 3535620), (8, 2651715), (9, 2357080), (10, 2121372), (11, 1928520), (12, 1767810), (15, 1414248), (18, 1178540), (20, 1060686), (22, 964260), (24, 883905), (30, 707124), (33, 642840), (36, 589270), (40, 530343), (44, 482130), (45, 471416), (55, 385704), (60, 353562), (66, 321420), (72, 294635), (88, 241065), (90, 235708), (99, 214280), (110, 192852), (120, 176781), (121, 175320), (132, 160710), (165, 128568), (180, 117854), (198, 107140), (220, 96426), (242, 87660), (264, 80355), (330, 64284), (360, 58927), (363, 58440), (396, 53570), (440, 48213), (484, 43830), (487, 43560), (495, 42856), (605, 35064), (660, 32142), (726, 29220), (792, 26785), (968, 21915), (974, 21780), (990, 21428), (1089, 19480), (1210, 17532), (1320, 16071), (1452, 14610), (1461, 14520), (1815, 11688), (1948, 10890), (1980, 10714), (2178, 9740), (2420, 8766), (2435, 8712), (2904, 7305), (2922, 7260), (3630, 5844), (3896, 5445), (3960, 5357), (4356, 4870), (4383, 4840)]