21639520

素因数分解:

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

素因数の和:300

約数の個数: 72

約数和(自身を含む): 58850064

約数和(自身を除く): 37210544

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 32, 35, 40, 56, 70, 80, 112, 139, 140, 160, 224, 278, 280, 556, 560, 695, 973, 1112, 1120, 1390, 1946, 2224, 2780, 3892, 4448, 4865, 5560, 7784, 9730, 11120, 15568, 19321, 19460, 22240, 31136, 38642, 38920, 77284, 77840, 96605, 135247, 154568, 155680, 193210, 270494, 309136, 386420, 540988, 618272, 676235, 772840, 1081976, 1352470, 1545680, 2163952, 2704940, 3091360, 4327904, 5409880, 10819760, 21639520]

約数ペア:

[(1, 21639520), (2, 10819760), (4, 5409880), (5, 4327904), (7, 3091360), (8, 2704940), (10, 2163952), (14, 1545680), (16, 1352470), (20, 1081976), (28, 772840), (32, 676235), (35, 618272), (40, 540988), (56, 386420), (70, 309136), (80, 270494), (112, 193210), (139, 155680), (140, 154568), (160, 135247), (224, 96605), (278, 77840), (280, 77284), (556, 38920), (560, 38642), (695, 31136), (973, 22240), (1112, 19460), (1120, 19321), (1390, 15568), (1946, 11120), (2224, 9730), (2780, 7784), (3892, 5560), (4448, 4865)]