21758720

素因数分解:

$2^8\times 5^1\times {\mathrm{89}}^1\times {\mathrm{191}}^1$

素因数の和:301

約数の個数: 72

約数和(自身を含む): 52980480

約数和(自身を除く): 31221760

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 89, 128, 160, 178, 191, 256, 320, 356, 382, 445, 640, 712, 764, 890, 955, 1280, 1424, 1528, 1780, 1910, 2848, 3056, 3560, 3820, 5696, 6112, 7120, 7640, 11392, 12224, 14240, 15280, 16999, 22784, 24448, 28480, 30560, 33998, 48896, 56960, 61120, 67996, 84995, 113920, 122240, 135992, 169990, 244480, 271984, 339980, 543968, 679960, 1087936, 1359920, 2175872, 2719840, 4351744, 5439680, 10879360, 21758720]

約数ペア:

[(1, 21758720), (2, 10879360), (4, 5439680), (5, 4351744), (8, 2719840), (10, 2175872), (16, 1359920), (20, 1087936), (32, 679960), (40, 543968), (64, 339980), (80, 271984), (89, 244480), (128, 169990), (160, 135992), (178, 122240), (191, 113920), (256, 84995), (320, 67996), (356, 61120), (382, 56960), (445, 48896), (640, 33998), (712, 30560), (764, 28480), (890, 24448), (955, 22784), (1280, 16999), (1424, 15280), (1528, 14240), (1780, 12224), (1910, 11392), (2848, 7640), (3056, 7120), (3560, 6112), (3820, 5696)]