20507500

素因数分解:

$2^2\times 5^4\times {\mathrm{13}}^1\times {\mathrm{631}}^1$

素因数の和:668

約数の個数: 60

約数和(自身を含む): 48372016

約数和(自身を除く): 27864516

約数列:

[1, 2, 4, 5, 10, 13, 20, 25, 26, 50, 52, 65, 100, 125, 130, 250, 260, 325, 500, 625, 631, 650, 1250, 1262, 1300, 1625, 2500, 2524, 3155, 3250, 6310, 6500, 8125, 8203, 12620, 15775, 16250, 16406, 31550, 32500, 32812, 41015, 63100, 78875, 82030, 157750, 164060, 205075, 315500, 394375, 410150, 788750, 820300, 1025375, 1577500, 2050750, 4101500, 5126875, 10253750, 20507500]

約数ペア:

[(1, 20507500), (2, 10253750), (4, 5126875), (5, 4101500), (10, 2050750), (13, 1577500), (20, 1025375), (25, 820300), (26, 788750), (50, 410150), (52, 394375), (65, 315500), (100, 205075), (125, 164060), (130, 157750), (250, 82030), (260, 78875), (325, 63100), (500, 41015), (625, 32812), (631, 32500), (650, 31550), (1250, 16406), (1262, 16250), (1300, 15775), (1625, 12620), (2500, 8203), (2524, 8125), (3155, 6500), (3250, 6310)]