155555980

素因数分解:

$2^2\times 5^1\times {\mathrm{89}}^1\times {\mathrm{281}}^1\times {\mathrm{311}}^1$

素因数の和:690

約数の個数: 48

約数和(自身を含む): 332579520

約数和(自身を除く): 177023540

約数列:

[1, 2, 4, 5, 10, 20, 89, 178, 281, 311, 356, 445, 562, 622, 890, 1124, 1244, 1405, 1555, 1780, 2810, 3110, 5620, 6220, 25009, 27679, 50018, 55358, 87391, 100036, 110716, 125045, 138395, 174782, 250090, 276790, 349564, 436955, 500180, 553580, 873910, 1747820, 7777799, 15555598, 31111196, 38888995, 77777990, 155555980]

約数ペア:

[(1, 155555980), (2, 77777990), (4, 38888995), (5, 31111196), (10, 15555598), (20, 7777799), (89, 1747820), (178, 873910), (281, 553580), (311, 500180), (356, 436955), (445, 349564), (562, 276790), (622, 250090), (890, 174782), (1124, 138395), (1244, 125045), (1405, 110716), (1555, 100036), (1780, 87391), (2810, 55358), (3110, 50018), (5620, 27679), (6220, 25009)]