21219315

素因数分解:

$3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{37}}^1\times {\mathrm{173}}^1$

素因数の和:248

約数の個数: 64

約数和(自身を含む): 39989376

約数和(自身を除く): 18770061

約数列:

[1, 3, 5, 13, 15, 17, 37, 39, 51, 65, 85, 111, 173, 185, 195, 221, 255, 481, 519, 555, 629, 663, 865, 1105, 1443, 1887, 2249, 2405, 2595, 2941, 3145, 3315, 6401, 6747, 7215, 8177, 8823, 9435, 11245, 14705, 19203, 24531, 32005, 33735, 38233, 40885, 44115, 83213, 96015, 108817, 114699, 122655, 191165, 249639, 326451, 416065, 544085, 573495, 1248195, 1414621, 1632255, 4243863, 7073105, 21219315]

約数ペア:

[(1, 21219315), (3, 7073105), (5, 4243863), (13, 1632255), (15, 1414621), (17, 1248195), (37, 573495), (39, 544085), (51, 416065), (65, 326451), (85, 249639), (111, 191165), (173, 122655), (185, 114699), (195, 108817), (221, 96015), (255, 83213), (481, 44115), (519, 40885), (555, 38233), (629, 33735), (663, 32005), (865, 24531), (1105, 19203), (1443, 14705), (1887, 11245), (2249, 9435), (2405, 8823), (2595, 8177), (2941, 7215), (3145, 6747), (3315, 6401)]