20781424

素因数分解:

$2^4\times {\mathrm{41}}^1\times {\mathrm{79}}^1\times {\mathrm{401}}^1$

素因数の和:529

約数の個数: 40

約数和(自身を含む): 41872320

約数和(自身を除く): 21090896

約数列:

[1, 2, 4, 8, 16, 41, 79, 82, 158, 164, 316, 328, 401, 632, 656, 802, 1264, 1604, 3208, 3239, 6416, 6478, 12956, 16441, 25912, 31679, 32882, 51824, 63358, 65764, 126716, 131528, 253432, 263056, 506864, 1298839, 2597678, 5195356, 10390712, 20781424]

約数ペア:

[(1, 20781424), (2, 10390712), (4, 5195356), (8, 2597678), (16, 1298839), (41, 506864), (79, 263056), (82, 253432), (158, 131528), (164, 126716), (316, 65764), (328, 63358), (401, 51824), (632, 32882), (656, 31679), (802, 25912), (1264, 16441), (1604, 12956), (3208, 6478), (3239, 6416)]