20925940

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{131}}^1\times {\mathrm{163}}^1$

素因数の和:317

約数の個数: 72

約数和(自身を含む): 51825312

約数和(自身を除く): 30899372

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 131, 140, 163, 196, 245, 262, 326, 490, 524, 652, 655, 815, 917, 980, 1141, 1310, 1630, 1834, 2282, 2620, 3260, 3668, 4564, 4585, 5705, 6419, 7987, 9170, 11410, 12838, 15974, 18340, 21353, 22820, 25676, 31948, 32095, 39935, 42706, 64190, 79870, 85412, 106765, 128380, 149471, 159740, 213530, 298942, 427060, 597884, 747355, 1046297, 1494710, 2092594, 2989420, 4185188, 5231485, 10462970, 20925940]

約数ペア:

[(1, 20925940), (2, 10462970), (4, 5231485), (5, 4185188), (7, 2989420), (10, 2092594), (14, 1494710), (20, 1046297), (28, 747355), (35, 597884), (49, 427060), (70, 298942), (98, 213530), (131, 159740), (140, 149471), (163, 128380), (196, 106765), (245, 85412), (262, 79870), (326, 64190), (490, 42706), (524, 39935), (652, 32095), (655, 31948), (815, 25676), (917, 22820), (980, 21353), (1141, 18340), (1310, 15974), (1630, 12838), (1834, 11410), (2282, 9170), (2620, 7987), (3260, 6419), (3668, 5705), (4564, 4585)]