21013210

素因数分解:

$2^1\times 5^1\times {\mathrm{67}}^1\times {\mathrm{79}}^1\times {\mathrm{397}}^1$

素因数の和:550

約数の個数: 32

約数和(自身を含む): 38972160

約数和(自身を除く): 17958950

約数列:

[1, 2, 5, 10, 67, 79, 134, 158, 335, 395, 397, 670, 790, 794, 1985, 3970, 5293, 10586, 26465, 26599, 31363, 52930, 53198, 62726, 132995, 156815, 265990, 313630, 2101321, 4202642, 10506605, 21013210]

約数ペア:

[(1, 21013210), (2, 10506605), (5, 4202642), (10, 2101321), (67, 313630), (79, 265990), (134, 156815), (158, 132995), (335, 62726), (395, 53198), (397, 52930), (670, 31363), (790, 26599), (794, 26465), (1985, 10586), (3970, 5293)]