21138978

素因数分解:

$2^1\times 3^1\times 7^1\times {\mathrm{23}}^1\times {\mathrm{79}}^1\times {\mathrm{277}}^1$

素因数の和:391

約数の個数: 64

約数和(自身を含む): 51240960

約数和(自身を除く): 30101982

約数列:

[1, 2, 3, 6, 7, 14, 21, 23, 42, 46, 69, 79, 138, 158, 161, 237, 277, 322, 474, 483, 553, 554, 831, 966, 1106, 1659, 1662, 1817, 1939, 3318, 3634, 3878, 5451, 5817, 6371, 10902, 11634, 12719, 12742, 19113, 21883, 25438, 38157, 38226, 43766, 44597, 65649, 76314, 89194, 131298, 133791, 153181, 267582, 306362, 459543, 503309, 919086, 1006618, 1509927, 3019854, 3523163, 7046326, 10569489, 21138978]

約数ペア:

[(1, 21138978), (2, 10569489), (3, 7046326), (6, 3523163), (7, 3019854), (14, 1509927), (21, 1006618), (23, 919086), (42, 503309), (46, 459543), (69, 306362), (79, 267582), (138, 153181), (158, 133791), (161, 131298), (237, 89194), (277, 76314), (322, 65649), (474, 44597), (483, 43766), (553, 38226), (554, 38157), (831, 25438), (966, 21883), (1106, 19113), (1659, 12742), (1662, 12719), (1817, 11634), (1939, 10902), (3318, 6371), (3634, 5817), (3878, 5451)]