21064780

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{23}}^2\times {\mathrm{181}}^1$

素因数の和:247

約数の個数: 72

約数和(自身を含む): 50725584

約数和(自身を除く): 29660804

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 23, 44, 46, 55, 92, 110, 115, 181, 220, 230, 253, 362, 460, 506, 529, 724, 905, 1012, 1058, 1265, 1810, 1991, 2116, 2530, 2645, 3620, 3982, 4163, 5060, 5290, 5819, 7964, 8326, 9955, 10580, 11638, 16652, 19910, 20815, 23276, 29095, 39820, 41630, 45793, 58190, 83260, 91586, 95749, 116380, 183172, 191498, 228965, 382996, 457930, 478745, 915860, 957490, 1053239, 1914980, 2106478, 4212956, 5266195, 10532390, 21064780]

約数ペア:

[(1, 21064780), (2, 10532390), (4, 5266195), (5, 4212956), (10, 2106478), (11, 1914980), (20, 1053239), (22, 957490), (23, 915860), (44, 478745), (46, 457930), (55, 382996), (92, 228965), (110, 191498), (115, 183172), (181, 116380), (220, 95749), (230, 91586), (253, 83260), (362, 58190), (460, 45793), (506, 41630), (529, 39820), (724, 29095), (905, 23276), (1012, 20815), (1058, 19910), (1265, 16652), (1810, 11638), (1991, 10580), (2116, 9955), (2530, 8326), (2645, 7964), (3620, 5819), (3982, 5290), (4163, 5060)]