20987680

素因数分解:

$2^5\times 5^1\times 7^2\times {\mathrm{2677}}^1$

素因数の和:2706

約数の個数: 72

約数和(自身を含む): 57700188

約数和(自身を除く): 36712508

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 32, 35, 40, 49, 56, 70, 80, 98, 112, 140, 160, 196, 224, 245, 280, 392, 490, 560, 784, 980, 1120, 1568, 1960, 2677, 3920, 5354, 7840, 10708, 13385, 18739, 21416, 26770, 37478, 42832, 53540, 74956, 85664, 93695, 107080, 131173, 149912, 187390, 214160, 262346, 299824, 374780, 428320, 524692, 599648, 655865, 749560, 1049384, 1311730, 1499120, 2098768, 2623460, 2998240, 4197536, 5246920, 10493840, 20987680]

約数ペア:

[(1, 20987680), (2, 10493840), (4, 5246920), (5, 4197536), (7, 2998240), (8, 2623460), (10, 2098768), (14, 1499120), (16, 1311730), (20, 1049384), (28, 749560), (32, 655865), (35, 599648), (40, 524692), (49, 428320), (56, 374780), (70, 299824), (80, 262346), (98, 214160), (112, 187390), (140, 149912), (160, 131173), (196, 107080), (224, 93695), (245, 85664), (280, 74956), (392, 53540), (490, 42832), (560, 37478), (784, 26770), (980, 21416), (1120, 18739), (1568, 13385), (1960, 10708), (2677, 7840), (3920, 5354)]