21264640

素因数分解:

$2^8\times 5^1\times {\mathrm{37}}^1\times {\mathrm{449}}^1$

素因数の和:507

約数の個数: 72

約数和(自身を含む): 52428600

約数和(自身を除く): 31163960

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 37, 40, 64, 74, 80, 128, 148, 160, 185, 256, 296, 320, 370, 449, 592, 640, 740, 898, 1184, 1280, 1480, 1796, 2245, 2368, 2960, 3592, 4490, 4736, 5920, 7184, 8980, 9472, 11840, 14368, 16613, 17960, 23680, 28736, 33226, 35920, 47360, 57472, 66452, 71840, 83065, 114944, 132904, 143680, 166130, 265808, 287360, 332260, 531616, 574720, 664520, 1063232, 1329040, 2126464, 2658080, 4252928, 5316160, 10632320, 21264640]

約数ペア:

[(1, 21264640), (2, 10632320), (4, 5316160), (5, 4252928), (8, 2658080), (10, 2126464), (16, 1329040), (20, 1063232), (32, 664520), (37, 574720), (40, 531616), (64, 332260), (74, 287360), (80, 265808), (128, 166130), (148, 143680), (160, 132904), (185, 114944), (256, 83065), (296, 71840), (320, 66452), (370, 57472), (449, 47360), (592, 35920), (640, 33226), (740, 28736), (898, 23680), (1184, 17960), (1280, 16613), (1480, 14368), (1796, 11840), (2245, 9472), (2368, 8980), (2960, 7184), (3592, 5920), (4490, 4736)]