21297980

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{131}}^1\times {\mathrm{739}}^1$

素因数の和:890

約数の個数: 48

約数和(自身を含む): 49230720

約数和(自身を除く): 27932740

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 131, 220, 262, 524, 655, 739, 1310, 1441, 1478, 2620, 2882, 2956, 3695, 5764, 7205, 7390, 8129, 14410, 14780, 16258, 28820, 32516, 40645, 81290, 96809, 162580, 193618, 387236, 484045, 968090, 1064899, 1936180, 2129798, 4259596, 5324495, 10648990, 21297980]

約数ペア:

[(1, 21297980), (2, 10648990), (4, 5324495), (5, 4259596), (10, 2129798), (11, 1936180), (20, 1064899), (22, 968090), (44, 484045), (55, 387236), (110, 193618), (131, 162580), (220, 96809), (262, 81290), (524, 40645), (655, 32516), (739, 28820), (1310, 16258), (1441, 14780), (1478, 14410), (2620, 8129), (2882, 7390), (2956, 7205), (3695, 5764)]