21041265

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{53}}^1\times {\mathrm{199}}^1$

素因数の和:286

約数の個数: 64

約数和(自身を含む): 41472000

約数和(自身を除く): 20430735

約数列:

[1, 3, 5, 7, 15, 19, 21, 35, 53, 57, 95, 105, 133, 159, 199, 265, 285, 371, 399, 597, 665, 795, 995, 1007, 1113, 1393, 1855, 1995, 2985, 3021, 3781, 4179, 5035, 5565, 6965, 7049, 10547, 11343, 15105, 18905, 20895, 21147, 26467, 31641, 35245, 52735, 56715, 73829, 79401, 105735, 132335, 158205, 200393, 221487, 369145, 397005, 601179, 1001965, 1107435, 1402751, 3005895, 4208253, 7013755, 21041265]

約数ペア:

[(1, 21041265), (3, 7013755), (5, 4208253), (7, 3005895), (15, 1402751), (19, 1107435), (21, 1001965), (35, 601179), (53, 397005), (57, 369145), (95, 221487), (105, 200393), (133, 158205), (159, 132335), (199, 105735), (265, 79401), (285, 73829), (371, 56715), (399, 52735), (597, 35245), (665, 31641), (795, 26467), (995, 21147), (1007, 20895), (1113, 18905), (1393, 15105), (1855, 11343), (1995, 10547), (2985, 7049), (3021, 6965), (3781, 5565), (4179, 5035)]