81278015

素因数分解:

$5^1\times 7^2\times {\mathrm{13}}^3\times {\mathrm{151}}^1$

素因数の和:209

約数の個数: 48

約数和(自身を含む): 123721920

約数和(自身を除く): 42443905

約数列:

[1, 5, 7, 13, 35, 49, 65, 91, 151, 169, 245, 455, 637, 755, 845, 1057, 1183, 1963, 2197, 3185, 5285, 5915, 7399, 8281, 9815, 10985, 13741, 15379, 25519, 36995, 41405, 68705, 76895, 96187, 107653, 127595, 178633, 331747, 480935, 538265, 893165, 1250431, 1658735, 2322229, 6252155, 11611145, 16255603, 81278015]

約数ペア:

[(1, 81278015), (5, 16255603), (7, 11611145), (13, 6252155), (35, 2322229), (49, 1658735), (65, 1250431), (91, 893165), (151, 538265), (169, 480935), (245, 331747), (455, 178633), (637, 127595), (755, 107653), (845, 96187), (1057, 76895), (1183, 68705), (1963, 41405), (2197, 36995), (3185, 25519), (5285, 15379), (5915, 13741), (7399, 10985), (8281, 9815)]