21515980

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{41}}^1\times {\mathrm{1381}}^1$

素因数の和:1450

約数の個数: 48

約数和(自身を含む): 48756960

約数和(自身を除く): 27240980

約数列:

[1, 2, 4, 5, 10, 19, 20, 38, 41, 76, 82, 95, 164, 190, 205, 380, 410, 779, 820, 1381, 1558, 2762, 3116, 3895, 5524, 6905, 7790, 13810, 15580, 26239, 27620, 52478, 56621, 104956, 113242, 131195, 226484, 262390, 283105, 524780, 566210, 1075799, 1132420, 2151598, 4303196, 5378995, 10757990, 21515980]

約数ペア:

[(1, 21515980), (2, 10757990), (4, 5378995), (5, 4303196), (10, 2151598), (19, 1132420), (20, 1075799), (38, 566210), (41, 524780), (76, 283105), (82, 262390), (95, 226484), (164, 131195), (190, 113242), (205, 104956), (380, 56621), (410, 52478), (779, 27620), (820, 26239), (1381, 15580), (1558, 13810), (2762, 7790), (3116, 6905), (3895, 5524)]