19804980

素因数分解:

$2^2\times 3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{25391}}^1$

素因数の和:25416

約数の個数: 48

約数和(自身を含む): 59721984

約数和(自身を除く): 39917004

約数列:

[1, 2, 3, 4, 5, 6, 10, 12, 13, 15, 20, 26, 30, 39, 52, 60, 65, 78, 130, 156, 195, 260, 390, 780, 25391, 50782, 76173, 101564, 126955, 152346, 253910, 304692, 330083, 380865, 507820, 660166, 761730, 990249, 1320332, 1523460, 1650415, 1980498, 3300830, 3960996, 4951245, 6601660, 9902490, 19804980]

約数ペア:

[(1, 19804980), (2, 9902490), (3, 6601660), (4, 4951245), (5, 3960996), (6, 3300830), (10, 1980498), (12, 1650415), (13, 1523460), (15, 1320332), (20, 990249), (26, 761730), (30, 660166), (39, 507820), (52, 380865), (60, 330083), (65, 304692), (78, 253910), (130, 152346), (156, 126955), (195, 101564), (260, 76173), (390, 50782), (780, 25391)]