19561990

素因数分解:

$2^1\times 5^1\times 7^1\times {\mathrm{43}}^1\times {\mathrm{67}}^1\times {\mathrm{97}}^1$

素因数の和:221

約数の個数: 64

約数和(自身を含む): 42223104

約数和(自身を除く): 22661114

約数列:

[1, 2, 5, 7, 10, 14, 35, 43, 67, 70, 86, 97, 134, 194, 215, 301, 335, 430, 469, 485, 602, 670, 679, 938, 970, 1358, 1505, 2345, 2881, 3010, 3395, 4171, 4690, 5762, 6499, 6790, 8342, 12998, 14405, 20167, 20855, 28810, 29197, 32495, 40334, 41710, 45493, 58394, 64990, 90986, 100835, 145985, 201670, 227465, 279457, 291970, 454930, 558914, 1397285, 1956199, 2794570, 3912398, 9780995, 19561990]

約数ペア:

[(1, 19561990), (2, 9780995), (5, 3912398), (7, 2794570), (10, 1956199), (14, 1397285), (35, 558914), (43, 454930), (67, 291970), (70, 279457), (86, 227465), (97, 201670), (134, 145985), (194, 100835), (215, 90986), (301, 64990), (335, 58394), (430, 45493), (469, 41710), (485, 40334), (602, 32495), (670, 29197), (679, 28810), (938, 20855), (970, 20167), (1358, 14405), (1505, 12998), (2345, 8342), (2881, 6790), (3010, 6499), (3395, 5762), (4171, 4690)]