21128980

素因数分解:

$2^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{53}}^1\times {\mathrm{643}}^1$

素因数の和:736

約数の個数: 48

約数和(自身を含む): 46738944

約数和(自身を除く): 25609964

約数列:

[1, 2, 4, 5, 10, 20, 31, 53, 62, 106, 124, 155, 212, 265, 310, 530, 620, 643, 1060, 1286, 1643, 2572, 3215, 3286, 6430, 6572, 8215, 12860, 16430, 19933, 32860, 34079, 39866, 68158, 79732, 99665, 136316, 170395, 199330, 340790, 398660, 681580, 1056449, 2112898, 4225796, 5282245, 10564490, 21128980]

約数ペア:

[(1, 21128980), (2, 10564490), (4, 5282245), (5, 4225796), (10, 2112898), (20, 1056449), (31, 681580), (53, 398660), (62, 340790), (106, 199330), (124, 170395), (155, 136316), (212, 99665), (265, 79732), (310, 68158), (530, 39866), (620, 34079), (643, 32860), (1060, 19933), (1286, 16430), (1643, 12860), (2572, 8215), (3215, 6572), (3286, 6430)]