21221720

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{37}}^1\times {\mathrm{1103}}^1$

素因数の和:1164

約数の個数: 64

約数和(自身を含む): 52859520

約数和(自身を除く): 31637800

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 37, 40, 52, 65, 74, 104, 130, 148, 185, 260, 296, 370, 481, 520, 740, 962, 1103, 1480, 1924, 2206, 2405, 3848, 4412, 4810, 5515, 8824, 9620, 11030, 14339, 19240, 22060, 28678, 40811, 44120, 57356, 71695, 81622, 114712, 143390, 163244, 204055, 286780, 326488, 408110, 530543, 573560, 816220, 1061086, 1632440, 2122172, 2652715, 4244344, 5305430, 10610860, 21221720]

約数ペア:

[(1, 21221720), (2, 10610860), (4, 5305430), (5, 4244344), (8, 2652715), (10, 2122172), (13, 1632440), (20, 1061086), (26, 816220), (37, 573560), (40, 530543), (52, 408110), (65, 326488), (74, 286780), (104, 204055), (130, 163244), (148, 143390), (185, 114712), (260, 81622), (296, 71695), (370, 57356), (481, 44120), (520, 40811), (740, 28678), (962, 22060), (1103, 19240), (1480, 14339), (1924, 11030), (2206, 9620), (2405, 8824), (3848, 5515), (4412, 4810)]