18661520

素因数分解:

$2^4\times 5^1\times {\mathrm{89}}^1\times {\mathrm{2621}}^1$

素因数の和:2723

約数の個数: 40

約数和(自身を含む): 43892280

約数和(自身を除く): 25230760

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 89, 178, 356, 445, 712, 890, 1424, 1780, 2621, 3560, 5242, 7120, 10484, 13105, 20968, 26210, 41936, 52420, 104840, 209680, 233269, 466538, 933076, 1166345, 1866152, 2332690, 3732304, 4665380, 9330760, 18661520]

約数ペア:

[(1, 18661520), (2, 9330760), (4, 4665380), (5, 3732304), (8, 2332690), (10, 1866152), (16, 1166345), (20, 933076), (40, 466538), (80, 233269), (89, 209680), (178, 104840), (356, 52420), (445, 41936), (712, 26210), (890, 20968), (1424, 13105), (1780, 10484), (2621, 7120), (3560, 5242)]