20100400

素因数分解:

$2^4\times 5^2\times {\mathrm{31}}^1\times {\mathrm{1621}}^1$

素因数の和:1670

約数の個数: 60

約数和(自身を含む): 49879744

約数和(自身を除く): 29779344

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 31, 40, 50, 62, 80, 100, 124, 155, 200, 248, 310, 400, 496, 620, 775, 1240, 1550, 1621, 2480, 3100, 3242, 6200, 6484, 8105, 12400, 12968, 16210, 25936, 32420, 40525, 50251, 64840, 81050, 100502, 129680, 162100, 201004, 251255, 324200, 402008, 502510, 648400, 804016, 1005020, 1256275, 2010040, 2512550, 4020080, 5025100, 10050200, 20100400]

約数ペア:

[(1, 20100400), (2, 10050200), (4, 5025100), (5, 4020080), (8, 2512550), (10, 2010040), (16, 1256275), (20, 1005020), (25, 804016), (31, 648400), (40, 502510), (50, 402008), (62, 324200), (80, 251255), (100, 201004), (124, 162100), (155, 129680), (200, 100502), (248, 81050), (310, 64840), (400, 50251), (496, 40525), (620, 32420), (775, 25936), (1240, 16210), (1550, 12968), (1621, 12400), (2480, 8105), (3100, 6484), (3242, 6200)]