20387420

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{61}}^1\times {\mathrm{983}}^1$

素因数の和:1070

約数の個数: 48

約数和(自身を含む): 46122048

約数和(自身を除く): 25734628

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 61, 68, 85, 122, 170, 244, 305, 340, 610, 983, 1037, 1220, 1966, 2074, 3932, 4148, 4915, 5185, 9830, 10370, 16711, 19660, 20740, 33422, 59963, 66844, 83555, 119926, 167110, 239852, 299815, 334220, 599630, 1019371, 1199260, 2038742, 4077484, 5096855, 10193710, 20387420]

約数ペア:

[(1, 20387420), (2, 10193710), (4, 5096855), (5, 4077484), (10, 2038742), (17, 1199260), (20, 1019371), (34, 599630), (61, 334220), (68, 299815), (85, 239852), (122, 167110), (170, 119926), (244, 83555), (305, 66844), (340, 59963), (610, 33422), (983, 20740), (1037, 19660), (1220, 16711), (1966, 10370), (2074, 9830), (3932, 5185), (4148, 4915)]