21939015

素因数分解:

$3^1\times 5^1\times 7^2\times {\mathrm{19}}^1\times {\mathrm{1571}}^1$

素因数の和:1612

約数の個数: 48

約数和(自身を含む): 43009920

約数和(自身を除く): 21070905

約数列:

[1, 3, 5, 7, 15, 19, 21, 35, 49, 57, 95, 105, 133, 147, 245, 285, 399, 665, 735, 931, 1571, 1995, 2793, 4655, 4713, 7855, 10997, 13965, 23565, 29849, 32991, 54985, 76979, 89547, 149245, 164955, 208943, 230937, 384895, 447735, 626829, 1044715, 1154685, 1462601, 3134145, 4387803, 7313005, 21939015]

約数ペア:

[(1, 21939015), (3, 7313005), (5, 4387803), (7, 3134145), (15, 1462601), (19, 1154685), (21, 1044715), (35, 626829), (49, 447735), (57, 384895), (95, 230937), (105, 208943), (133, 164955), (147, 149245), (245, 89547), (285, 76979), (399, 54985), (665, 32991), (735, 29849), (931, 23565), (1571, 13965), (1995, 10997), (2793, 7855), (4655, 4713)]