21397761

素因数分解:

$3^2\times 7^2\times {\mathrm{11}}^2\times {\mathrm{401}}^1$

素因数の和:443

約数の個数: 54

約数和(自身を含む): 39618306

約数和(自身を除く): 18220545

約数列:

[1, 3, 7, 9, 11, 21, 33, 49, 63, 77, 99, 121, 147, 231, 363, 401, 441, 539, 693, 847, 1089, 1203, 1617, 2541, 2807, 3609, 4411, 4851, 5929, 7623, 8421, 13233, 17787, 19649, 25263, 30877, 39699, 48521, 53361, 58947, 92631, 145563, 176841, 216139, 277893, 339647, 436689, 648417, 1018941, 1945251, 2377529, 3056823, 7132587, 21397761]

約数ペア:

[(1, 21397761), (3, 7132587), (7, 3056823), (9, 2377529), (11, 1945251), (21, 1018941), (33, 648417), (49, 436689), (63, 339647), (77, 277893), (99, 216139), (121, 176841), (147, 145563), (231, 92631), (363, 58947), (401, 53361), (441, 48521), (539, 39699), (693, 30877), (847, 25263), (1089, 19649), (1203, 17787), (1617, 13233), (2541, 8421), (2807, 7623), (3609, 5929), (4411, 4851)]