20554550

素因数分解:

$2^1\times 5^2\times {\mathrm{31}}^1\times {\mathrm{89}}^1\times {\mathrm{149}}^1$

素因数の和:281

約数の個数: 48

約数和(自身を含む): 40176000

約数和(自身を除く): 19621450

約数列:

[1, 2, 5, 10, 25, 31, 50, 62, 89, 149, 155, 178, 298, 310, 445, 745, 775, 890, 1490, 1550, 2225, 2759, 3725, 4450, 4619, 5518, 7450, 9238, 13261, 13795, 23095, 26522, 27590, 46190, 66305, 68975, 115475, 132610, 137950, 230950, 331525, 411091, 663050, 822182, 2055455, 4110910, 10277275, 20554550]

約数ペア:

[(1, 20554550), (2, 10277275), (5, 4110910), (10, 2055455), (25, 822182), (31, 663050), (50, 411091), (62, 331525), (89, 230950), (149, 137950), (155, 132610), (178, 115475), (298, 68975), (310, 66305), (445, 46190), (745, 27590), (775, 26522), (890, 23095), (1490, 13795), (1550, 13261), (2225, 9238), (2759, 7450), (3725, 5518), (4450, 4619)]