19997500

素因数分解:

$2^2\times 5^4\times {\mathrm{19}}^1\times {\mathrm{421}}^1$

素因数の和:464

約数の個数: 60

約数和(自身を含む): 46141480

約数和(自身を除く): 26143980

約数列:

[1, 2, 4, 5, 10, 19, 20, 25, 38, 50, 76, 95, 100, 125, 190, 250, 380, 421, 475, 500, 625, 842, 950, 1250, 1684, 1900, 2105, 2375, 2500, 4210, 4750, 7999, 8420, 9500, 10525, 11875, 15998, 21050, 23750, 31996, 39995, 42100, 47500, 52625, 79990, 105250, 159980, 199975, 210500, 263125, 399950, 526250, 799900, 999875, 1052500, 1999750, 3999500, 4999375, 9998750, 19997500]

約数ペア:

[(1, 19997500), (2, 9998750), (4, 4999375), (5, 3999500), (10, 1999750), (19, 1052500), (20, 999875), (25, 799900), (38, 526250), (50, 399950), (76, 263125), (95, 210500), (100, 199975), (125, 159980), (190, 105250), (250, 79990), (380, 52625), (421, 47500), (475, 42100), (500, 39995), (625, 31996), (842, 23750), (950, 21050), (1250, 15998), (1684, 11875), (1900, 10525), (2105, 9500), (2375, 8420), (2500, 7999), (4210, 4750)]