20965984

素因数分解:

$2^5\times {\mathrm{13}}^1\times {\mathrm{101}}^1\times {\mathrm{499}}^1$

素因数の和:623

約数の個数: 48

約数和(自身を含む): 44982000

約数和(自身を除く): 24016016

約数列:

[1, 2, 4, 8, 13, 16, 26, 32, 52, 101, 104, 202, 208, 404, 416, 499, 808, 998, 1313, 1616, 1996, 2626, 3232, 3992, 5252, 6487, 7984, 10504, 12974, 15968, 21008, 25948, 42016, 50399, 51896, 100798, 103792, 201596, 207584, 403192, 655187, 806384, 1310374, 1612768, 2620748, 5241496, 10482992, 20965984]

約数ペア:

[(1, 20965984), (2, 10482992), (4, 5241496), (8, 2620748), (13, 1612768), (16, 1310374), (26, 806384), (32, 655187), (52, 403192), (101, 207584), (104, 201596), (202, 103792), (208, 100798), (404, 51896), (416, 50399), (499, 42016), (808, 25948), (998, 21008), (1313, 15968), (1616, 12974), (1996, 10504), (2626, 7984), (3232, 6487), (3992, 5252)]