20721250

素因数分解:

$2^1\times 5^4\times {\mathrm{11}}^2\times {\mathrm{137}}^1$

素因数の和:181

約数の個数: 60

約数和(自身を含む): 43003422

約数和(自身を除く): 22282172

約数列:

[1, 2, 5, 10, 11, 22, 25, 50, 55, 110, 121, 125, 137, 242, 250, 274, 275, 550, 605, 625, 685, 1210, 1250, 1370, 1375, 1507, 2750, 3014, 3025, 3425, 6050, 6850, 6875, 7535, 13750, 15070, 15125, 16577, 17125, 30250, 33154, 34250, 37675, 75350, 75625, 82885, 85625, 151250, 165770, 171250, 188375, 376750, 414425, 828850, 941875, 1883750, 2072125, 4144250, 10360625, 20721250]

約数ペア:

[(1, 20721250), (2, 10360625), (5, 4144250), (10, 2072125), (11, 1883750), (22, 941875), (25, 828850), (50, 414425), (55, 376750), (110, 188375), (121, 171250), (125, 165770), (137, 151250), (242, 85625), (250, 82885), (274, 75625), (275, 75350), (550, 37675), (605, 34250), (625, 33154), (685, 30250), (1210, 17125), (1250, 16577), (1370, 15125), (1375, 15070), (1507, 13750), (2750, 7535), (3014, 6875), (3025, 6850), (3425, 6050)]