21640450

素因数分解:

$2^1\times 5^2\times {\mathrm{13}}^3\times {\mathrm{197}}^1$

素因数の和:248

約数の個数: 48

約数和(自身を含む): 43825320

約数和(自身を除く): 22184870

約数列:

[1, 2, 5, 10, 13, 25, 26, 50, 65, 130, 169, 197, 325, 338, 394, 650, 845, 985, 1690, 1970, 2197, 2561, 4225, 4394, 4925, 5122, 8450, 9850, 10985, 12805, 21970, 25610, 33293, 54925, 64025, 66586, 109850, 128050, 166465, 332930, 432809, 832325, 865618, 1664650, 2164045, 4328090, 10820225, 21640450]

約数ペア:

[(1, 21640450), (2, 10820225), (5, 4328090), (10, 2164045), (13, 1664650), (25, 865618), (26, 832325), (50, 432809), (65, 332930), (130, 166465), (169, 128050), (197, 109850), (325, 66586), (338, 64025), (394, 54925), (650, 33293), (845, 25610), (985, 21970), (1690, 12805), (1970, 10985), (2197, 9850), (2561, 8450), (4225, 5122), (4394, 4925)]