21319220

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{167}}^1\times {\mathrm{491}}^1$

素因数の和:680

約数の個数: 48

約数和(自身を含む): 48601728

約数和(自身を除く): 27282508

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 167, 260, 334, 491, 668, 835, 982, 1670, 1964, 2171, 2455, 3340, 4342, 4910, 6383, 8684, 9820, 10855, 12766, 21710, 25532, 31915, 43420, 63830, 81997, 127660, 163994, 327988, 409985, 819970, 1065961, 1639940, 2131922, 4263844, 5329805, 10659610, 21319220]

約数ペア:

[(1, 21319220), (2, 10659610), (4, 5329805), (5, 4263844), (10, 2131922), (13, 1639940), (20, 1065961), (26, 819970), (52, 409985), (65, 327988), (130, 163994), (167, 127660), (260, 81997), (334, 63830), (491, 43420), (668, 31915), (835, 25532), (982, 21710), (1670, 12766), (1964, 10855), (2171, 9820), (2455, 8684), (3340, 6383), (4342, 4910)]