641720

素因数分解:

$2^3\times 5^1\times {\mathrm{61}}^1\times {\mathrm{263}}^1$

素因数の和:335

約数の個数: 32

約数和(自身を含む): 1473120

約数和(自身を除く): 831400

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 61, 122, 244, 263, 305, 488, 526, 610, 1052, 1220, 1315, 2104, 2440, 2630, 5260, 10520, 16043, 32086, 64172, 80215, 128344, 160430, 320860, 641720]

約数ペア:

[(1, 641720), (2, 320860), (4, 160430), (5, 128344), (8, 80215), (10, 64172), (20, 32086), (40, 16043), (61, 10520), (122, 5260), (244, 2630), (263, 2440), (305, 2104), (488, 1315), (526, 1220), (610, 1052)]