21205545

素因数分解:

$3^1\times 5^1\times {\mathrm{17}}^1\times {\mathrm{137}}^1\times {\mathrm{607}}^1$

素因数の和:769

約数の個数: 32

約数和(自身を含む): 36246528

約数和(自身を除く): 15040983

約数列:

[1, 3, 5, 15, 17, 51, 85, 137, 255, 411, 607, 685, 1821, 2055, 2329, 3035, 6987, 9105, 10319, 11645, 30957, 34935, 51595, 83159, 154785, 249477, 415795, 1247385, 1413703, 4241109, 7068515, 21205545]

約数ペア:

[(1, 21205545), (3, 7068515), (5, 4241109), (15, 1413703), (17, 1247385), (51, 415795), (85, 249477), (137, 154785), (255, 83159), (411, 51595), (607, 34935), (685, 30957), (1821, 11645), (2055, 10319), (2329, 9105), (3035, 6987)]