21385235

素因数分解:

$5^1\times {\mathrm{17}}^1\times {\mathrm{47}}^1\times {\mathrm{53}}^1\times {\mathrm{101}}^1$

素因数の和:223

約数の個数: 32

約数和(自身を含む): 28553472

約数和(自身を除く): 7168237

約数列:

[1, 5, 17, 47, 53, 85, 101, 235, 265, 505, 799, 901, 1717, 2491, 3995, 4505, 4747, 5353, 8585, 12455, 23735, 26765, 42347, 80699, 91001, 211735, 251591, 403495, 455005, 1257955, 4277047, 21385235]

約数ペア:

[(1, 21385235), (5, 4277047), (17, 1257955), (47, 455005), (53, 403495), (85, 251591), (101, 211735), (235, 91001), (265, 80699), (505, 42347), (799, 26765), (901, 23735), (1717, 12455), (2491, 8585), (3995, 5353), (4505, 4747)]