21417920

素因数分解:

$2^6\times 5^1\times {\mathrm{66931}}^1$

素因数の和:66948

約数の個数: 28

約数和(自身を含む): 51002184

約数和(自身を除く): 29584264

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 160, 320, 66931, 133862, 267724, 334655, 535448, 669310, 1070896, 1338620, 2141792, 2677240, 4283584, 5354480, 10708960, 21417920]

約数ペア:

[(1, 21417920), (2, 10708960), (4, 5354480), (5, 4283584), (8, 2677240), (10, 2141792), (16, 1338620), (20, 1070896), (32, 669310), (40, 535448), (64, 334655), (80, 267724), (160, 133862), (320, 66931)]