20981996

素因数分解:

$2^2\times 7^3\times {\mathrm{41}}^1\times {\mathrm{373}}^1$

素因数の和:439

約数の個数: 48

約数和(自身を含む): 43982400

約数和(自身を除く): 23000404

約数列:

[1, 2, 4, 7, 14, 28, 41, 49, 82, 98, 164, 196, 287, 343, 373, 574, 686, 746, 1148, 1372, 1492, 2009, 2611, 4018, 5222, 8036, 10444, 14063, 15293, 18277, 28126, 30586, 36554, 56252, 61172, 73108, 107051, 127939, 214102, 255878, 428204, 511756, 749357, 1498714, 2997428, 5245499, 10490998, 20981996]

約数ペア:

[(1, 20981996), (2, 10490998), (4, 5245499), (7, 2997428), (14, 1498714), (28, 749357), (41, 511756), (49, 428204), (82, 255878), (98, 214102), (164, 127939), (196, 107051), (287, 73108), (343, 61172), (373, 56252), (574, 36554), (686, 30586), (746, 28126), (1148, 18277), (1372, 15293), (1492, 14063), (2009, 10444), (2611, 8036), (4018, 5222)]