21100520

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{179}}^1\times {\mathrm{421}}^1$

素因数の和:618

約数の個数: 64

約数和(自身を含む): 54691200

約数和(自身を除く): 33590680

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 179, 280, 358, 421, 716, 842, 895, 1253, 1432, 1684, 1790, 2105, 2506, 2947, 3368, 3580, 4210, 5012, 5894, 6265, 7160, 8420, 10024, 11788, 12530, 14735, 16840, 23576, 25060, 29470, 50120, 58940, 75359, 117880, 150718, 301436, 376795, 527513, 602872, 753590, 1055026, 1507180, 2110052, 2637565, 3014360, 4220104, 5275130, 10550260, 21100520]

約数ペア:

[(1, 21100520), (2, 10550260), (4, 5275130), (5, 4220104), (7, 3014360), (8, 2637565), (10, 2110052), (14, 1507180), (20, 1055026), (28, 753590), (35, 602872), (40, 527513), (56, 376795), (70, 301436), (140, 150718), (179, 117880), (280, 75359), (358, 58940), (421, 50120), (716, 29470), (842, 25060), (895, 23576), (1253, 16840), (1432, 14735), (1684, 12530), (1790, 11788), (2105, 10024), (2506, 8420), (2947, 7160), (3368, 6265), (3580, 5894), (4210, 5012)]