20897500

素因数分解:

$2^2\times 5^4\times {\mathrm{13}}^1\times {\mathrm{643}}^1$

素因数の和:680

約数の個数: 60

約数和(自身を含む): 49290472

約数和(自身を除く): 28392972

約数列:

[1, 2, 4, 5, 10, 13, 20, 25, 26, 50, 52, 65, 100, 125, 130, 250, 260, 325, 500, 625, 643, 650, 1250, 1286, 1300, 1625, 2500, 2572, 3215, 3250, 6430, 6500, 8125, 8359, 12860, 16075, 16250, 16718, 32150, 32500, 33436, 41795, 64300, 80375, 83590, 160750, 167180, 208975, 321500, 401875, 417950, 803750, 835900, 1044875, 1607500, 2089750, 4179500, 5224375, 10448750, 20897500]

約数ペア:

[(1, 20897500), (2, 10448750), (4, 5224375), (5, 4179500), (10, 2089750), (13, 1607500), (20, 1044875), (25, 835900), (26, 803750), (50, 417950), (52, 401875), (65, 321500), (100, 208975), (125, 167180), (130, 160750), (250, 83590), (260, 80375), (325, 64300), (500, 41795), (625, 33436), (643, 32500), (650, 32150), (1250, 16718), (1286, 16250), (1300, 16075), (1625, 12860), (2500, 8359), (2572, 8125), (3215, 6500), (3250, 6430)]