20987395

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{149}}^1\times {\mathrm{197}}^1$

素因数の和:375

約数の個数: 32

約数和(自身を含む): 29937600

約数和(自身を除く): 8950205

約数列:

[1, 5, 11, 13, 55, 65, 143, 149, 197, 715, 745, 985, 1639, 1937, 2167, 2561, 8195, 9685, 10835, 12805, 21307, 28171, 29353, 106535, 140855, 146765, 322883, 381589, 1614415, 1907945, 4197479, 20987395]

約数ペア:

[(1, 20987395), (5, 4197479), (11, 1907945), (13, 1614415), (55, 381589), (65, 322883), (143, 146765), (149, 140855), (197, 106535), (715, 29353), (745, 28171), (985, 21307), (1639, 12805), (1937, 10835), (2167, 9685), (2561, 8195)]