19809620

素因数分解:

$2^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{89}}^1\times {\mathrm{359}}^1$

素因数の和:488

約数の個数: 48

約数和(自身を含む): 43545600

約数和(自身を除く): 23735980

約数列:

[1, 2, 4, 5, 10, 20, 31, 62, 89, 124, 155, 178, 310, 356, 359, 445, 620, 718, 890, 1436, 1780, 1795, 2759, 3590, 5518, 7180, 11036, 11129, 13795, 22258, 27590, 31951, 44516, 55180, 55645, 63902, 111290, 127804, 159755, 222580, 319510, 639020, 990481, 1980962, 3961924, 4952405, 9904810, 19809620]

約数ペア:

[(1, 19809620), (2, 9904810), (4, 4952405), (5, 3961924), (10, 1980962), (20, 990481), (31, 639020), (62, 319510), (89, 222580), (124, 159755), (155, 127804), (178, 111290), (310, 63902), (356, 55645), (359, 55180), (445, 44516), (620, 31951), (718, 27590), (890, 22258), (1436, 13795), (1780, 11129), (1795, 11036), (2759, 7180), (3590, 5518)]