21418551

素因数分解:

$3^2\times 7^1\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{997}}^1$

素因数の和:1052

約数の個数: 48

約数和(自身を含む): 39856128

約数和(自身を除く): 18437577

約数列:

[1, 3, 7, 9, 11, 21, 31, 33, 63, 77, 93, 99, 217, 231, 279, 341, 651, 693, 997, 1023, 1953, 2387, 2991, 3069, 6979, 7161, 8973, 10967, 20937, 21483, 30907, 32901, 62811, 76769, 92721, 98703, 216349, 230307, 278163, 339977, 649047, 690921, 1019931, 1947141, 2379839, 3059793, 7139517, 21418551]

約数ペア:

[(1, 21418551), (3, 7139517), (7, 3059793), (9, 2379839), (11, 1947141), (21, 1019931), (31, 690921), (33, 649047), (63, 339977), (77, 278163), (93, 230307), (99, 216349), (217, 98703), (231, 92721), (279, 76769), (341, 62811), (651, 32901), (693, 30907), (997, 21483), (1023, 20937), (1953, 10967), (2387, 8973), (2991, 7161), (3069, 6979)]