21759725

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{41}}^1\times {\mathrm{71}}^1$

素因数の和:158

約数の個数: 48

約数和(自身を含む): 31497984

約数和(自身を除く): 9738259

約数列:

[1, 5, 13, 23, 25, 41, 65, 71, 115, 205, 299, 325, 355, 533, 575, 923, 943, 1025, 1495, 1633, 1775, 2665, 2911, 4615, 4715, 7475, 8165, 12259, 13325, 14555, 21229, 23075, 23575, 37843, 40825, 61295, 66953, 72775, 106145, 189215, 306475, 334765, 530725, 870389, 946075, 1673825, 4351945, 21759725]

約数ペア:

[(1, 21759725), (5, 4351945), (13, 1673825), (23, 946075), (25, 870389), (41, 530725), (65, 334765), (71, 306475), (115, 189215), (205, 106145), (299, 72775), (325, 66953), (355, 61295), (533, 40825), (575, 37843), (923, 23575), (943, 23075), (1025, 21229), (1495, 14555), (1633, 13325), (1775, 12259), (2665, 8165), (2911, 7475), (4615, 4715)]