21187660

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{4289}}^1$

素因数の和:4330

約数の個数: 48

約数和(自身を含む): 50450400

約数和(自身を除く): 29262740

約数列:

[1, 2, 4, 5, 10, 13, 19, 20, 26, 38, 52, 65, 76, 95, 130, 190, 247, 260, 380, 494, 988, 1235, 2470, 4289, 4940, 8578, 17156, 21445, 42890, 55757, 81491, 85780, 111514, 162982, 223028, 278785, 325964, 407455, 557570, 814910, 1059383, 1115140, 1629820, 2118766, 4237532, 5296915, 10593830, 21187660]

約数ペア:

[(1, 21187660), (2, 10593830), (4, 5296915), (5, 4237532), (10, 2118766), (13, 1629820), (19, 1115140), (20, 1059383), (26, 814910), (38, 557570), (52, 407455), (65, 325964), (76, 278785), (95, 223028), (130, 162982), (190, 111514), (247, 85780), (260, 81491), (380, 55757), (494, 42890), (988, 21445), (1235, 17156), (2470, 8578), (4289, 4940)]