21312460

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{81971}}^1$

素因数の和:81993

約数の個数: 24

約数和(自身を含む): 48199536

約数和(自身を除く): 26887076

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 81971, 163942, 327884, 409855, 819710, 1065623, 1639420, 2131246, 4262492, 5328115, 10656230, 21312460]

約数ペア:

[(1, 21312460), (2, 10656230), (4, 5328115), (5, 4262492), (10, 2131246), (13, 1639420), (20, 1065623), (26, 819710), (52, 409855), (65, 327884), (130, 163942), (260, 81971)]