20781530

素因数分解:

$2^1\times 5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{137}}^1\times {\mathrm{197}}^1$

素因数の和:359

約数の個数: 64

約数和(自身を含む): 47215872

約数和(自身を除く): 26434342

約数列:

[1, 2, 5, 7, 10, 11, 14, 22, 35, 55, 70, 77, 110, 137, 154, 197, 274, 385, 394, 685, 770, 959, 985, 1370, 1379, 1507, 1918, 1970, 2167, 2758, 3014, 4334, 4795, 6895, 7535, 9590, 10549, 10835, 13790, 15070, 15169, 21098, 21670, 26989, 30338, 52745, 53978, 75845, 105490, 134945, 151690, 188923, 269890, 296879, 377846, 593758, 944615, 1484395, 1889230, 2078153, 2968790, 4156306, 10390765, 20781530]

約数ペア:

[(1, 20781530), (2, 10390765), (5, 4156306), (7, 2968790), (10, 2078153), (11, 1889230), (14, 1484395), (22, 944615), (35, 593758), (55, 377846), (70, 296879), (77, 269890), (110, 188923), (137, 151690), (154, 134945), (197, 105490), (274, 75845), (385, 53978), (394, 52745), (685, 30338), (770, 26989), (959, 21670), (985, 21098), (1370, 15169), (1379, 15070), (1507, 13790), (1918, 10835), (1970, 10549), (2167, 9590), (2758, 7535), (3014, 6895), (4334, 4795)]