18953980

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{107}}^1\times {\mathrm{521}}^1$

素因数の和:654

約数の個数: 48

約数和(自身を含む): 42620256

約数和(自身を除く): 23666276

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 68, 85, 107, 170, 214, 340, 428, 521, 535, 1042, 1070, 1819, 2084, 2140, 2605, 3638, 5210, 7276, 8857, 9095, 10420, 17714, 18190, 35428, 36380, 44285, 55747, 88570, 111494, 177140, 222988, 278735, 557470, 947699, 1114940, 1895398, 3790796, 4738495, 9476990, 18953980]

約数ペア:

[(1, 18953980), (2, 9476990), (4, 4738495), (5, 3790796), (10, 1895398), (17, 1114940), (20, 947699), (34, 557470), (68, 278735), (85, 222988), (107, 177140), (170, 111494), (214, 88570), (340, 55747), (428, 44285), (521, 36380), (535, 35428), (1042, 18190), (1070, 17714), (1819, 10420), (2084, 9095), (2140, 8857), (2605, 7276), (3638, 5210)]