21290464

素因数分解:

$2^5\times {\mathrm{13}}^1\times {\mathrm{61}}^1\times {\mathrm{839}}^1$

素因数の和:923

約数の個数: 48

約数和(自身を含む): 45934560

約数和(自身を除く): 24644096

約数列:

[1, 2, 4, 8, 13, 16, 26, 32, 52, 61, 104, 122, 208, 244, 416, 488, 793, 839, 976, 1586, 1678, 1952, 3172, 3356, 6344, 6712, 10907, 12688, 13424, 21814, 25376, 26848, 43628, 51179, 87256, 102358, 174512, 204716, 349024, 409432, 665327, 818864, 1330654, 1637728, 2661308, 5322616, 10645232, 21290464]

約数ペア:

[(1, 21290464), (2, 10645232), (4, 5322616), (8, 2661308), (13, 1637728), (16, 1330654), (26, 818864), (32, 665327), (52, 409432), (61, 349024), (104, 204716), (122, 174512), (208, 102358), (244, 87256), (416, 51179), (488, 43628), (793, 26848), (839, 25376), (976, 21814), (1586, 13424), (1678, 12688), (1952, 10907), (3172, 6712), (3356, 6344)]