20881280

素因数分解:

$2^7\times 5^1\times 7^1\times {\mathrm{59}}^1\times {\mathrm{79}}^1$

素因数の和:164

約数の個数: 128

約数和(自身を含む): 58752000

約数和(自身を除く): 37870720

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 32, 35, 40, 56, 59, 64, 70, 79, 80, 112, 118, 128, 140, 158, 160, 224, 236, 280, 295, 316, 320, 395, 413, 448, 472, 553, 560, 590, 632, 640, 790, 826, 896, 944, 1106, 1120, 1180, 1264, 1580, 1652, 1888, 2065, 2212, 2240, 2360, 2528, 2765, 3160, 3304, 3776, 4130, 4424, 4480, 4661, 4720, 5056, 5530, 6320, 6608, 7552, 8260, 8848, 9322, 9440, 10112, 11060, 12640, 13216, 16520, 17696, 18644, 18880, 22120, 23305, 25280, 26432, 32627, 33040, 35392, 37288, 37760, 44240, 46610, 50560, 52864, 65254, 66080, 70784, 74576, 88480, 93220, 130508, 132160, 149152, 163135, 176960, 186440, 261016, 264320, 298304, 326270, 353920, 372880, 522032, 596608, 652540, 745760, 1044064, 1305080, 1491520, 2088128, 2610160, 2983040, 4176256, 5220320, 10440640, 20881280]

約数ペア:

[(1, 20881280), (2, 10440640), (4, 5220320), (5, 4176256), (7, 2983040), (8, 2610160), (10, 2088128), (14, 1491520), (16, 1305080), (20, 1044064), (28, 745760), (32, 652540), (35, 596608), (40, 522032), (56, 372880), (59, 353920), (64, 326270), (70, 298304), (79, 264320), (80, 261016), (112, 186440), (118, 176960), (128, 163135), (140, 149152), (158, 132160), (160, 130508), (224, 93220), (236, 88480), (280, 74576), (295, 70784), (316, 66080), (320, 65254), (395, 52864), (413, 50560), (448, 46610), (472, 44240), (553, 37760), (560, 37288), (590, 35392), (632, 33040), (640, 32627), (790, 26432), (826, 25280), (896, 23305), (944, 22120), (1106, 18880), (1120, 18644), (1180, 17696), (1264, 16520), (1580, 13216), (1652, 12640), (1888, 11060), (2065, 10112), (2212, 9440), (2240, 9322), (2360, 8848), (2528, 8260), (2765, 7552), (3160, 6608), (3304, 6320), (3776, 5530), (4130, 5056), (4424, 4720), (4480, 4661)]