21290985

素因数分解:

$3^3\times 5^1\times {\mathrm{23}}^1\times {\mathrm{6857}}^1$

素因数の和:6894

約数の個数: 32

約数和(自身を含む): 39502080

約数和(自身を除く): 18211095

約数列:

[1, 3, 5, 9, 15, 23, 27, 45, 69, 115, 135, 207, 345, 621, 1035, 3105, 6857, 20571, 34285, 61713, 102855, 157711, 185139, 308565, 473133, 788555, 925695, 1419399, 2365665, 4258197, 7096995, 21290985]

約数ペア:

[(1, 21290985), (3, 7096995), (5, 4258197), (9, 2365665), (15, 1419399), (23, 925695), (27, 788555), (45, 473133), (69, 308565), (115, 185139), (135, 157711), (207, 102855), (345, 61713), (621, 34285), (1035, 20571), (3105, 6857)]