20944280

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{131}}^1\times {\mathrm{571}}^1$

素因数の和:720

約数の個数: 64

約数和(自身を含む): 54362880

約数和(自身を除く): 33418600

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 131, 140, 262, 280, 524, 571, 655, 917, 1048, 1142, 1310, 1834, 2284, 2620, 2855, 3668, 3997, 4568, 4585, 5240, 5710, 7336, 7994, 9170, 11420, 15988, 18340, 19985, 22840, 31976, 36680, 39970, 74801, 79940, 149602, 159880, 299204, 374005, 523607, 598408, 748010, 1047214, 1496020, 2094428, 2618035, 2992040, 4188856, 5236070, 10472140, 20944280]

約数ペア:

[(1, 20944280), (2, 10472140), (4, 5236070), (5, 4188856), (7, 2992040), (8, 2618035), (10, 2094428), (14, 1496020), (20, 1047214), (28, 748010), (35, 598408), (40, 523607), (56, 374005), (70, 299204), (131, 159880), (140, 149602), (262, 79940), (280, 74801), (524, 39970), (571, 36680), (655, 31976), (917, 22840), (1048, 19985), (1142, 18340), (1310, 15988), (1834, 11420), (2284, 9170), (2620, 7994), (2855, 7336), (3668, 5710), (3997, 5240), (4568, 4585)]