20535860

素因数分解:

$2^2\times 5^1\times {\mathrm{83}}^1\times {\mathrm{89}}^1\times {\mathrm{139}}^1$

素因数の和:320

約数の個数: 48

約数和(自身を含む): 44452800

約数和(自身を除く): 23916940

約数列:

[1, 2, 4, 5, 10, 20, 83, 89, 139, 166, 178, 278, 332, 356, 415, 445, 556, 695, 830, 890, 1390, 1660, 1780, 2780, 7387, 11537, 12371, 14774, 23074, 24742, 29548, 36935, 46148, 49484, 57685, 61855, 73870, 115370, 123710, 147740, 230740, 247420, 1026793, 2053586, 4107172, 5133965, 10267930, 20535860]

約数ペア:

[(1, 20535860), (2, 10267930), (4, 5133965), (5, 4107172), (10, 2053586), (20, 1026793), (83, 247420), (89, 230740), (139, 147740), (166, 123710), (178, 115370), (278, 73870), (332, 61855), (356, 57685), (415, 49484), (445, 46148), (556, 36935), (695, 29548), (830, 24742), (890, 23074), (1390, 14774), (1660, 12371), (1780, 11537), (2780, 7387)]