398401820

素因数分解:

$2^2\times 5^1\times {\mathrm{991}}^1\times {\mathrm{20101}}^1$

素因数の和:21101

約数の個数: 24

約数和(自身を含む): 837529728

約数和(自身を除く): 439127908

約数列:

[1, 2, 4, 5, 10, 20, 991, 1982, 3964, 4955, 9910, 19820, 20101, 40202, 80404, 100505, 201010, 402020, 19920091, 39840182, 79680364, 99600455, 199200910, 398401820]

約数ペア:

[(1, 398401820), (2, 199200910), (4, 99600455), (5, 79680364), (10, 39840182), (20, 19920091), (991, 402020), (1982, 201010), (3964, 100505), (4955, 80404), (9910, 40202), (19820, 20101)]