21031857

素因数分解:

$3^2\times 7^1\times {\mathrm{11}}^2\times {\mathrm{31}}^1\times {\mathrm{89}}^1$

素因数の和:155

約数の個数: 72

約数和(自身を含む): 39836160

約数和(自身を除く): 18804303

約数列:

[1, 3, 7, 9, 11, 21, 31, 33, 63, 77, 89, 93, 99, 121, 217, 231, 267, 279, 341, 363, 623, 651, 693, 801, 847, 979, 1023, 1089, 1869, 1953, 2387, 2541, 2759, 2937, 3069, 3751, 5607, 6853, 7161, 7623, 8277, 8811, 10769, 11253, 19313, 20559, 21483, 24831, 26257, 30349, 32307, 33759, 57939, 61677, 75383, 78771, 91047, 96921, 173817, 212443, 226149, 236313, 273141, 333839, 637329, 678447, 1001517, 1911987, 2336873, 3004551, 7010619, 21031857]

約数ペア:

[(1, 21031857), (3, 7010619), (7, 3004551), (9, 2336873), (11, 1911987), (21, 1001517), (31, 678447), (33, 637329), (63, 333839), (77, 273141), (89, 236313), (93, 226149), (99, 212443), (121, 173817), (217, 96921), (231, 91047), (267, 78771), (279, 75383), (341, 61677), (363, 57939), (623, 33759), (651, 32307), (693, 30349), (801, 26257), (847, 24831), (979, 21483), (1023, 20559), (1089, 19313), (1869, 11253), (1953, 10769), (2387, 8811), (2541, 8277), (2759, 7623), (2937, 7161), (3069, 6853), (3751, 5607)]