21401830

素因数分解:

$2^1\times 5^1\times {\mathrm{89}}^1\times {\mathrm{139}}^1\times {\mathrm{173}}^1$

素因数の和:408

約数の個数: 32

約数和(自身を含む): 39463200

約数和(自身を除く): 18061370

約数列:

[1, 2, 5, 10, 89, 139, 173, 178, 278, 346, 445, 695, 865, 890, 1390, 1730, 12371, 15397, 24047, 24742, 30794, 48094, 61855, 76985, 120235, 123710, 153970, 240470, 2140183, 4280366, 10700915, 21401830]

約数ペア:

[(1, 21401830), (2, 10700915), (5, 4280366), (10, 2140183), (89, 240470), (139, 153970), (173, 123710), (178, 120235), (278, 76985), (346, 61855), (445, 48094), (695, 30794), (865, 24742), (890, 24047), (1390, 15397), (1730, 12371)]