20988331

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{61}}^1\times {\mathrm{199}}^1$

素因数の和:299

約数の個数: 32

約数和(自身を含む): 27776000

約数和(自身を除く): 6787669

約数列:

[1, 7, 13, 19, 61, 91, 133, 199, 247, 427, 793, 1159, 1393, 1729, 2587, 3781, 5551, 8113, 12139, 15067, 18109, 26467, 49153, 84973, 105469, 157807, 230641, 344071, 1104649, 1614487, 2998333, 20988331]

約数ペア:

[(1, 20988331), (7, 2998333), (13, 1614487), (19, 1104649), (61, 344071), (91, 230641), (133, 157807), (199, 105469), (247, 84973), (427, 49153), (793, 26467), (1159, 18109), (1393, 15067), (1729, 12139), (2587, 8113), (3781, 5551)]