20905648

素因数分解:

$2^4\times {\mathrm{17}}^1\times {\mathrm{151}}^1\times {\mathrm{509}}^1$

素因数の和:685

約数の個数: 40

約数和(自身を含む): 43256160

約数和(自身を除く): 22350512

約数列:

[1, 2, 4, 8, 16, 17, 34, 68, 136, 151, 272, 302, 509, 604, 1018, 1208, 2036, 2416, 2567, 4072, 5134, 8144, 8653, 10268, 17306, 20536, 34612, 41072, 69224, 76859, 138448, 153718, 307436, 614872, 1229744, 1306603, 2613206, 5226412, 10452824, 20905648]

約数ペア:

[(1, 20905648), (2, 10452824), (4, 5226412), (8, 2613206), (16, 1306603), (17, 1229744), (34, 614872), (68, 307436), (136, 153718), (151, 138448), (272, 76859), (302, 69224), (509, 41072), (604, 34612), (1018, 20536), (1208, 17306), (2036, 10268), (2416, 8653), (2567, 8144), (4072, 5134)]