21055720

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{139}}^1\times {\mathrm{541}}^1$

素因数の和:698

約数の個数: 64

約数和(自身を含む): 54633600

約数和(自身を除く): 33577880

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 139, 140, 278, 280, 541, 556, 695, 973, 1082, 1112, 1390, 1946, 2164, 2705, 2780, 3787, 3892, 4328, 4865, 5410, 5560, 7574, 7784, 9730, 10820, 15148, 18935, 19460, 21640, 30296, 37870, 38920, 75199, 75740, 150398, 151480, 300796, 375995, 526393, 601592, 751990, 1052786, 1503980, 2105572, 2631965, 3007960, 4211144, 5263930, 10527860, 21055720]

約数ペア:

[(1, 21055720), (2, 10527860), (4, 5263930), (5, 4211144), (7, 3007960), (8, 2631965), (10, 2105572), (14, 1503980), (20, 1052786), (28, 751990), (35, 601592), (40, 526393), (56, 375995), (70, 300796), (139, 151480), (140, 150398), (278, 75740), (280, 75199), (541, 38920), (556, 37870), (695, 30296), (973, 21640), (1082, 19460), (1112, 18935), (1390, 15148), (1946, 10820), (2164, 9730), (2705, 7784), (2780, 7574), (3787, 5560), (3892, 5410), (4328, 4865)]