21709720

素因数分解:

$2^3\times 5^1\times {\mathrm{409}}^1\times {\mathrm{1327}}^1$

素因数の和:1747

約数の個数: 32

約数和(自身を含む): 49003200

約数和(自身を除く): 27293480

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 409, 818, 1327, 1636, 2045, 2654, 3272, 4090, 5308, 6635, 8180, 10616, 13270, 16360, 26540, 53080, 542743, 1085486, 2170972, 2713715, 4341944, 5427430, 10854860, 21709720]

約数ペア:

[(1, 21709720), (2, 10854860), (4, 5427430), (5, 4341944), (8, 2713715), (10, 2170972), (20, 1085486), (40, 542743), (409, 53080), (818, 26540), (1327, 16360), (1636, 13270), (2045, 10616), (2654, 8180), (3272, 6635), (4090, 5308)]