18139780

素因数分解:

$2^2\times 5^1\times {\mathrm{53}}^1\times {\mathrm{109}}^1\times {\mathrm{157}}^1$

素因数の和:328

約数の個数: 48

約数和(自身を含む): 39417840

約数和(自身を除く): 21278060

約数列:

[1, 2, 4, 5, 10, 20, 53, 106, 109, 157, 212, 218, 265, 314, 436, 530, 545, 628, 785, 1060, 1090, 1570, 2180, 3140, 5777, 8321, 11554, 16642, 17113, 23108, 28885, 33284, 34226, 41605, 57770, 68452, 83210, 85565, 115540, 166420, 171130, 342260, 906989, 1813978, 3627956, 4534945, 9069890, 18139780]

約数ペア:

[(1, 18139780), (2, 9069890), (4, 4534945), (5, 3627956), (10, 1813978), (20, 906989), (53, 342260), (106, 171130), (109, 166420), (157, 115540), (212, 85565), (218, 83210), (265, 68452), (314, 57770), (436, 41605), (530, 34226), (545, 33284), (628, 28885), (785, 23108), (1060, 17113), (1090, 16642), (1570, 11554), (2180, 8321), (3140, 5777)]