19996880

素因数分解:

$2^4\times 5^1\times {\mathrm{181}}^1\times {\mathrm{1381}}^1$

素因数の和:1575

約数の個数: 40

約数和(自身を含む): 46783464

約数和(自身を除く): 26786584

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 181, 362, 724, 905, 1381, 1448, 1810, 2762, 2896, 3620, 5524, 6905, 7240, 11048, 13810, 14480, 22096, 27620, 55240, 110480, 249961, 499922, 999844, 1249805, 1999688, 2499610, 3999376, 4999220, 9998440, 19996880]

約数ペア:

[(1, 19996880), (2, 9998440), (4, 4999220), (5, 3999376), (8, 2499610), (10, 1999688), (16, 1249805), (20, 999844), (40, 499922), (80, 249961), (181, 110480), (362, 55240), (724, 27620), (905, 22096), (1381, 14480), (1448, 13810), (1810, 11048), (2762, 7240), (2896, 6905), (3620, 5524)]