20456800

素因数分解:

$2^5\times 5^2\times 7^1\times {\mathrm{13}}^1\times {\mathrm{281}}^1$

素因数の和:321

約数の個数: 144

約数和(自身を含む): 61683552

約数和(自身を除く): 41226752

約数列:

[1, 2, 4, 5, 7, 8, 10, 13, 14, 16, 20, 25, 26, 28, 32, 35, 40, 50, 52, 56, 65, 70, 80, 91, 100, 104, 112, 130, 140, 160, 175, 182, 200, 208, 224, 260, 280, 281, 325, 350, 364, 400, 416, 455, 520, 560, 562, 650, 700, 728, 800, 910, 1040, 1120, 1124, 1300, 1400, 1405, 1456, 1820, 1967, 2080, 2248, 2275, 2600, 2800, 2810, 2912, 3640, 3653, 3934, 4496, 4550, 5200, 5600, 5620, 7025, 7280, 7306, 7868, 8992, 9100, 9835, 10400, 11240, 14050, 14560, 14612, 15736, 18200, 18265, 19670, 22480, 25571, 28100, 29224, 31472, 36400, 36530, 39340, 44960, 49175, 51142, 56200, 58448, 62944, 72800, 73060, 78680, 91325, 98350, 102284, 112400, 116896, 127855, 146120, 157360, 182650, 196700, 204568, 224800, 255710, 292240, 314720, 365300, 393400, 409136, 511420, 584480, 639275, 730600, 786800, 818272, 1022840, 1278550, 1461200, 1573600, 2045680, 2557100, 2922400, 4091360, 5114200, 10228400, 20456800]

約数ペア:

[(1, 20456800), (2, 10228400), (4, 5114200), (5, 4091360), (7, 2922400), (8, 2557100), (10, 2045680), (13, 1573600), (14, 1461200), (16, 1278550), (20, 1022840), (25, 818272), (26, 786800), (28, 730600), (32, 639275), (35, 584480), (40, 511420), (50, 409136), (52, 393400), (56, 365300), (65, 314720), (70, 292240), (80, 255710), (91, 224800), (100, 204568), (104, 196700), (112, 182650), (130, 157360), (140, 146120), (160, 127855), (175, 116896), (182, 112400), (200, 102284), (208, 98350), (224, 91325), (260, 78680), (280, 73060), (281, 72800), (325, 62944), (350, 58448), (364, 56200), (400, 51142), (416, 49175), (455, 44960), (520, 39340), (560, 36530), (562, 36400), (650, 31472), (700, 29224), (728, 28100), (800, 25571), (910, 22480), (1040, 19670), (1120, 18265), (1124, 18200), (1300, 15736), (1400, 14612), (1405, 14560), (1456, 14050), (1820, 11240), (1967, 10400), (2080, 9835), (2248, 9100), (2275, 8992), (2600, 7868), (2800, 7306), (2810, 7280), (2912, 7025), (3640, 5620), (3653, 5600), (3934, 5200), (4496, 4550)]