641680

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{617}}^1$

素因数の和:643

約数の個数: 40

約数和(自身を含む): 1609272

約数和(自身を除く): 967592

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 617, 1040, 1234, 2468, 3085, 4936, 6170, 8021, 9872, 12340, 16042, 24680, 32084, 40105, 49360, 64168, 80210, 128336, 160420, 320840, 641680]

約数ペア:

[(1, 641680), (2, 320840), (4, 160420), (5, 128336), (8, 80210), (10, 64168), (13, 49360), (16, 40105), (20, 32084), (26, 24680), (40, 16042), (52, 12340), (65, 9872), (80, 8021), (104, 6170), (130, 4936), (208, 3085), (260, 2468), (520, 1234), (617, 1040)]