21461960

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{149}}^1\times {\mathrm{277}}^1$

素因数の和:450

約数の個数: 64

約数和(自身を含む): 52542000

約数和(自身を除く): 31080040

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 149, 260, 277, 298, 520, 554, 596, 745, 1108, 1192, 1385, 1490, 1937, 2216, 2770, 2980, 3601, 3874, 5540, 5960, 7202, 7748, 9685, 11080, 14404, 15496, 18005, 19370, 28808, 36010, 38740, 41273, 72020, 77480, 82546, 144040, 165092, 206365, 330184, 412730, 536549, 825460, 1073098, 1650920, 2146196, 2682745, 4292392, 5365490, 10730980, 21461960]

約数ペア:

[(1, 21461960), (2, 10730980), (4, 5365490), (5, 4292392), (8, 2682745), (10, 2146196), (13, 1650920), (20, 1073098), (26, 825460), (40, 536549), (52, 412730), (65, 330184), (104, 206365), (130, 165092), (149, 144040), (260, 82546), (277, 77480), (298, 72020), (520, 41273), (554, 38740), (596, 36010), (745, 28808), (1108, 19370), (1192, 18005), (1385, 15496), (1490, 14404), (1937, 11080), (2216, 9685), (2770, 7748), (2980, 7202), (3601, 5960), (3874, 5540)]