21018920

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{83}}^1\times {\mathrm{487}}^1$

素因数の和:594

約数の個数: 64

約数和(自身を含む): 51649920

約数和(自身を除く): 30631000

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 83, 104, 130, 166, 260, 332, 415, 487, 520, 664, 830, 974, 1079, 1660, 1948, 2158, 2435, 3320, 3896, 4316, 4870, 5395, 6331, 8632, 9740, 10790, 12662, 19480, 21580, 25324, 31655, 40421, 43160, 50648, 63310, 80842, 126620, 161684, 202105, 253240, 323368, 404210, 525473, 808420, 1050946, 1616840, 2101892, 2627365, 4203784, 5254730, 10509460, 21018920]

約数ペア:

[(1, 21018920), (2, 10509460), (4, 5254730), (5, 4203784), (8, 2627365), (10, 2101892), (13, 1616840), (20, 1050946), (26, 808420), (40, 525473), (52, 404210), (65, 323368), (83, 253240), (104, 202105), (130, 161684), (166, 126620), (260, 80842), (332, 63310), (415, 50648), (487, 43160), (520, 40421), (664, 31655), (830, 25324), (974, 21580), (1079, 19480), (1660, 12662), (1948, 10790), (2158, 9740), (2435, 8632), (3320, 6331), (3896, 5395), (4316, 4870)]