19779921

素因数分解:

$3^2\times 7^1\times {\mathrm{61}}^1\times {\mathrm{5147}}^1$

素因数の和:5221

約数の個数: 24

約数和(自身を含む): 33194304

約数和(自身を除く): 13414383

約数列:

[1, 3, 7, 9, 21, 61, 63, 183, 427, 549, 1281, 3843, 5147, 15441, 36029, 46323, 108087, 313967, 324261, 941901, 2197769, 2825703, 6593307, 19779921]

約数ペア:

[(1, 19779921), (3, 6593307), (7, 2825703), (9, 2197769), (21, 941901), (61, 324261), (63, 313967), (183, 108087), (427, 46323), (549, 36029), (1281, 15441), (3843, 5147)]