21388480

素因数分解:

$2^6\times 5^1\times {\mathrm{89}}^1\times {\mathrm{751}}^1$

素因数の和:857

約数の個数: 56

約数和(自身を含む): 51572160

約数和(自身を除く): 30183680

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 89, 160, 178, 320, 356, 445, 712, 751, 890, 1424, 1502, 1780, 2848, 3004, 3560, 3755, 5696, 6008, 7120, 7510, 12016, 14240, 15020, 24032, 28480, 30040, 48064, 60080, 66839, 120160, 133678, 240320, 267356, 334195, 534712, 668390, 1069424, 1336780, 2138848, 2673560, 4277696, 5347120, 10694240, 21388480]

約数ペア:

[(1, 21388480), (2, 10694240), (4, 5347120), (5, 4277696), (8, 2673560), (10, 2138848), (16, 1336780), (20, 1069424), (32, 668390), (40, 534712), (64, 334195), (80, 267356), (89, 240320), (160, 133678), (178, 120160), (320, 66839), (356, 60080), (445, 48064), (712, 30040), (751, 28480), (890, 24032), (1424, 15020), (1502, 14240), (1780, 12016), (2848, 7510), (3004, 7120), (3560, 6008), (3755, 5696)]