20974720

素因数分解:

$2^7\times 5^1\times {\mathrm{13}}^1\times {\mathrm{2521}}^1$

素因数の和:2553

約数の個数: 64

約数和(自身を含む): 54021240

約数和(自身を除く): 33046520

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 32, 40, 52, 64, 65, 80, 104, 128, 130, 160, 208, 260, 320, 416, 520, 640, 832, 1040, 1664, 2080, 2521, 4160, 5042, 8320, 10084, 12605, 20168, 25210, 32773, 40336, 50420, 65546, 80672, 100840, 131092, 161344, 163865, 201680, 262184, 322688, 327730, 403360, 524368, 655460, 806720, 1048736, 1310920, 1613440, 2097472, 2621840, 4194944, 5243680, 10487360, 20974720]

約数ペア:

[(1, 20974720), (2, 10487360), (4, 5243680), (5, 4194944), (8, 2621840), (10, 2097472), (13, 1613440), (16, 1310920), (20, 1048736), (26, 806720), (32, 655460), (40, 524368), (52, 403360), (64, 327730), (65, 322688), (80, 262184), (104, 201680), (128, 163865), (130, 161344), (160, 131092), (208, 100840), (260, 80672), (320, 65546), (416, 50420), (520, 40336), (640, 32773), (832, 25210), (1040, 20168), (1664, 12605), (2080, 10084), (2521, 8320), (4160, 5042)]