19878820

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{101}}^1\times {\mathrm{757}}^1$

素因数の和:880

約数の個数: 48

約数和(自身を含む): 45461808

約数和(自身を除く): 25582988

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 101, 130, 202, 260, 404, 505, 757, 1010, 1313, 1514, 2020, 2626, 3028, 3785, 5252, 6565, 7570, 9841, 13130, 15140, 19682, 26260, 39364, 49205, 76457, 98410, 152914, 196820, 305828, 382285, 764570, 993941, 1529140, 1987882, 3975764, 4969705, 9939410, 19878820]

約数ペア:

[(1, 19878820), (2, 9939410), (4, 4969705), (5, 3975764), (10, 1987882), (13, 1529140), (20, 993941), (26, 764570), (52, 382285), (65, 305828), (101, 196820), (130, 152914), (202, 98410), (260, 76457), (404, 49205), (505, 39364), (757, 26260), (1010, 19682), (1313, 15140), (1514, 13130), (2020, 9841), (2626, 7570), (3028, 6565), (3785, 5252)]