21205919

素因数分解:

$7^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{83}}^1\times {\mathrm{113}}^1$

素因数の和:239

約数の個数: 32

約数和(自身を含む): 27578880

約数和(自身を除く): 6372961

約数列:

[1, 7, 17, 19, 83, 113, 119, 133, 323, 581, 791, 1411, 1577, 1921, 2147, 2261, 9379, 9877, 11039, 13447, 15029, 26809, 36499, 65653, 159443, 178201, 187663, 255493, 1116101, 1247407, 3029417, 21205919]

約数ペア:

[(1, 21205919), (7, 3029417), (17, 1247407), (19, 1116101), (83, 255493), (113, 187663), (119, 178201), (133, 159443), (323, 65653), (581, 36499), (791, 26809), (1411, 15029), (1577, 13447), (1921, 11039), (2147, 9877), (2261, 9379)]