20539420

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{89}}^1\times {\mathrm{1049}}^1$

素因数の和:1158

約数の個数: 48

約数和(自身を含む): 47628000

約数和(自身を除く): 27088580

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 89, 110, 178, 220, 356, 445, 890, 979, 1049, 1780, 1958, 2098, 3916, 4196, 4895, 5245, 9790, 10490, 11539, 19580, 20980, 23078, 46156, 57695, 93361, 115390, 186722, 230780, 373444, 466805, 933610, 1026971, 1867220, 2053942, 4107884, 5134855, 10269710, 20539420]

約数ペア:

[(1, 20539420), (2, 10269710), (4, 5134855), (5, 4107884), (10, 2053942), (11, 1867220), (20, 1026971), (22, 933610), (44, 466805), (55, 373444), (89, 230780), (110, 186722), (178, 115390), (220, 93361), (356, 57695), (445, 46156), (890, 23078), (979, 20980), (1049, 19580), (1780, 11539), (1958, 10490), (2098, 9790), (3916, 5245), (4196, 4895)]