20671036720

素因数分解:

$2^4\times 5^1\times {\mathrm{401}}^1\times {\mathrm{644359}}^1$

素因数の和:644773

約数の個数: 40

約数和(自身を含む): 48180085920

約数和(自身を除く): 27509049200

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 401, 802, 1604, 2005, 3208, 4010, 6416, 8020, 16040, 32080, 644359, 1288718, 2577436, 3221795, 5154872, 6443590, 10309744, 12887180, 25774360, 51548720, 258387959, 516775918, 1033551836, 1291939795, 2067103672, 2583879590, 4134207344, 5167759180, 10335518360, 20671036720]

約数ペア:

[(1, 20671036720), (2, 10335518360), (4, 5167759180), (5, 4134207344), (8, 2583879590), (10, 2067103672), (16, 1291939795), (20, 1033551836), (40, 516775918), (80, 258387959), (401, 51548720), (802, 25774360), (1604, 12887180), (2005, 10309744), (3208, 6443590), (4010, 5154872), (6416, 3221795), (8020, 2577436), (16040, 1288718), (32080, 644359)]