20986250

素因数分解:

$2^1\times 5^4\times {\mathrm{103}}^1\times {\mathrm{163}}^1$

素因数の和:288

約数の個数: 40

約数和(自身を含む): 39962208

約数和(自身を除く): 18975958

約数列:

[1, 2, 5, 10, 25, 50, 103, 125, 163, 206, 250, 326, 515, 625, 815, 1030, 1250, 1630, 2575, 4075, 5150, 8150, 12875, 16789, 20375, 25750, 33578, 40750, 64375, 83945, 101875, 128750, 167890, 203750, 419725, 839450, 2098625, 4197250, 10493125, 20986250]

約数ペア:

[(1, 20986250), (2, 10493125), (5, 4197250), (10, 2098625), (25, 839450), (50, 419725), (103, 203750), (125, 167890), (163, 128750), (206, 101875), (250, 83945), (326, 64375), (515, 40750), (625, 33578), (815, 25750), (1030, 20375), (1250, 16789), (1630, 12875), (2575, 8150), (4075, 5150)]