20802560

素因数分解:

$2^{10}\times 5^1\times {\mathrm{17}}^1\times {\mathrm{239}}^1$

素因数の和:281

約数の個数: 88

約数和(自身を含む): 53058240

約数和(自身を除く): 32255680

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 32, 34, 40, 64, 68, 80, 85, 128, 136, 160, 170, 239, 256, 272, 320, 340, 478, 512, 544, 640, 680, 956, 1024, 1088, 1195, 1280, 1360, 1912, 2176, 2390, 2560, 2720, 3824, 4063, 4352, 4780, 5120, 5440, 7648, 8126, 8704, 9560, 10880, 15296, 16252, 17408, 19120, 20315, 21760, 30592, 32504, 38240, 40630, 43520, 61184, 65008, 76480, 81260, 87040, 122368, 130016, 152960, 162520, 244736, 260032, 305920, 325040, 520064, 611840, 650080, 1040128, 1223680, 1300160, 2080256, 2600320, 4160512, 5200640, 10401280, 20802560]

約数ペア:

[(1, 20802560), (2, 10401280), (4, 5200640), (5, 4160512), (8, 2600320), (10, 2080256), (16, 1300160), (17, 1223680), (20, 1040128), (32, 650080), (34, 611840), (40, 520064), (64, 325040), (68, 305920), (80, 260032), (85, 244736), (128, 162520), (136, 152960), (160, 130016), (170, 122368), (239, 87040), (256, 81260), (272, 76480), (320, 65008), (340, 61184), (478, 43520), (512, 40630), (544, 38240), (640, 32504), (680, 30592), (956, 21760), (1024, 20315), (1088, 19120), (1195, 17408), (1280, 16252), (1360, 15296), (1912, 10880), (2176, 9560), (2390, 8704), (2560, 8126), (2720, 7648), (3824, 5440), (4063, 5120), (4352, 4780)]