21620920

素因数分解:

$2^3\times 5^1\times {\mathrm{23}}^1\times {\mathrm{71}}^1\times {\mathrm{331}}^1$

素因数の和:436

約数の個数: 64

約数和(自身を含む): 51632640

約数和(自身を除く): 30011720

約数列:

[1, 2, 4, 5, 8, 10, 20, 23, 40, 46, 71, 92, 115, 142, 184, 230, 284, 331, 355, 460, 568, 662, 710, 920, 1324, 1420, 1633, 1655, 2648, 2840, 3266, 3310, 6532, 6620, 7613, 8165, 13064, 13240, 15226, 16330, 23501, 30452, 32660, 38065, 47002, 60904, 65320, 76130, 94004, 117505, 152260, 188008, 235010, 304520, 470020, 540523, 940040, 1081046, 2162092, 2702615, 4324184, 5405230, 10810460, 21620920]

約数ペア:

[(1, 21620920), (2, 10810460), (4, 5405230), (5, 4324184), (8, 2702615), (10, 2162092), (20, 1081046), (23, 940040), (40, 540523), (46, 470020), (71, 304520), (92, 235010), (115, 188008), (142, 152260), (184, 117505), (230, 94004), (284, 76130), (331, 65320), (355, 60904), (460, 47002), (568, 38065), (662, 32660), (710, 30452), (920, 23501), (1324, 16330), (1420, 15226), (1633, 13240), (1655, 13064), (2648, 8165), (2840, 7613), (3266, 6620), (3310, 6532)]