399661640

素因数分解:

$2^3\times 5^1\times 7^2\times {\mathrm{203909}}^1$

素因数の和:203934

約数の個数: 48

約数和(自身を含む): 1046058300

約数和(自身を除く): 646396660

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 49, 56, 70, 98, 140, 196, 245, 280, 392, 490, 980, 1960, 203909, 407818, 815636, 1019545, 1427363, 1631272, 2039090, 2854726, 4078180, 5709452, 7136815, 8156360, 9991541, 11418904, 14273630, 19983082, 28547260, 39966164, 49957705, 57094520, 79932328, 99915410, 199830820, 399661640]

約数ペア:

[(1, 399661640), (2, 199830820), (4, 99915410), (5, 79932328), (7, 57094520), (8, 49957705), (10, 39966164), (14, 28547260), (20, 19983082), (28, 14273630), (35, 11418904), (40, 9991541), (49, 8156360), (56, 7136815), (70, 5709452), (98, 4078180), (140, 2854726), (196, 2039090), (245, 1631272), (280, 1427363), (392, 1019545), (490, 815636), (980, 407818), (1960, 203909)]